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1. "He dances very well" - This sentence is in the present tense and describes someone's ability to dance. The verb "dances" agrees with the third-person singular subject "he." It means that he is currently good at dancing.

2. "I was waiting for him but he (not come)" - This sentence is in the past tense. The phrase "but he (not come)" suggests that something did not happen. In this case, it means that he did not come. The verb "did not come" is the negative form of the past tense of the verb "come."

3. "Hurry up! The train just (arrive)" - This sentence is in the present perfect tense. The phrase "The train just (arrive)" means that the train has recently arrived. The verb "arrive" is in the past participle form because it is used in combination with the auxiliary verb "have" to form the present perfect tense.

4. "I (not read) the book yet" - This sentence is in the present perfect tense. The phrase "I (not read) the book yet" means that I have not read the book up until now. The verb "not read" is in the past participle form because it is used in combination with the auxiliary verb "have" to form the present perfect tense.

5. "Your friends already (leave)" - This sentence is in the present perfect tense. The phrase "Your friends already (leave)" means that your friends have already left. The verb "leave" is in the past participle form because it is used in combination with the auxiliary verb "have" to form the present perfect tense.

6. "They (leave) five minutes ago" - This sentence is in the past tense. The phrase "They (leave) five minutes ago" means that they left five minutes before now. The verb "leave" is used in its base form because it describes a past action.

7. "I (do) six exercises today" - This sentence is in the past tense. The phrase "I (do) six exercises today" means that I did six exercises earlier today. The verb "do" is used in its base form because it describes a past action.

8. "How long .. you (be) here?" - This sentence is asking about the duration of time. The phrase "How long .. you (be) here?" means "How long have you been here?" The verb "have been" is used in the present perfect tense to describe the length of time the person has been in that place.

9. ".. you (wait) for me yesterday?" - This sentence is in the past tense and asks about an action in the past. The phrase ".. you (wait) for me yesterday?" means "Were you waiting for me yesterday?" The verb "wait" is used in its base form because it describes a past action.

10. "It (rain) yesterday" - This sentence is in the past tense and describes the weather. The phrase "It (rain) yesterday" means that it rained yesterday. The verb "rain" is used in its base form because it describes a past action.

11. "Look! He (break) his car!" - This sentence is in the present tense and describes an action happening right now. The phrase "He (break) his car" means that he is currently breaking his car. The verb "break" is used in its base form because it describes a present action.

12. "We (get acquainted) five years ago" - This sentence is in the past tense. The phrase "We (get acquainted) five years ago" means that we became acquainted with each other five years ago. The verb "get acquainted" is used in its base form because it describes a past action.

13. "I (call) your uncle just now" - This sentence is in the past tense and describes an action that happened very recently. The phrase "I (call) your uncle just now" means that I called your uncle a very short time ago. The verb "call" is used in its base form because it describes a past action.

14. "They (not book) the hotel yet" - This sentence is in the present perfect tense. The phrase "They (not book) the hotel yet" means that they have not booked the hotel up until now. The verb "book" is in the past participle form because it is used in combination with the auxiliary verb "have" to form the present perfect tense.

15. "Nick (write) me a message thirty minutes ago" - This sentence is in the past tense and describes an action that happened thirty minutes ago. The phrase "Nick (write) me a message thirty minutes ago" means that Nick sent me a message thirty minutes in the past. The verb "write" is used in its base form because it describes a past action.

Yes, he does. He (attend) dancing classes. - This sentence is in the present tense. The phrase "Yes, he does. He (attend) dancing classes" means that he does attend dancing classes. The verb "attend" is used in its base form because it describes a present action.

I hope this helps clarify the usage of verb tenses in the given sentences. Let me know if you have any further questions!

1. Choose the correct item. 1. When Ryan was young, he used to go fishing.
Explanation: The correct answer is "used to" because it indicates a past habit or routine. In this case, Ryan used to go fishing when he was young.
Step-by-step solution: To choose the correct item, we need to understand the meaning of the sentence. It talks about Ryan's past habit or routine of going fishing when he was young. The correct answer is "used to" because it correctly expresses this past habit. "Using" and "use" are incorrect because they do not convey the same meaning as "used to".

2. Choose the correct item. 2. They had a flat tire.
Explanation: The correct answer is "had" because it indicates a past event of having a flat tire.
Step-by-step solution: To choose the correct item, we need to understand the meaning of the sentence. It talks about a past event of having a flat tire. The correct answer is "had" because it correctly conveys this past event. "Were driving" and "drove" are incorrect because they do not convey the same meaning as "had".

3. Choose the correct item. 3. Did they use to play the violin as a child?
Explanation: The correct answer is "use to" because it indicates a past habit or routine.
Step-by-step solution: To choose the correct item, we need to understand the meaning of the sentence. It asks about a past habit of playing the violin. The correct answer is "use to" because it correctly expresses this past habit. "Use" and "used" are incorrect because they do not convey the same meaning as "use to".

4. Choose the correct item. 4. They had been studying at university when they met.
Explanation: The correct answer is "had been studying" because it indicates a past continuous action that happened before another past event.
Step-by-step solution: To choose the correct item, we need to understand the meaning of the sentence. It talks about two past events - studying at university and meeting. The correct answer is "had been studying" because it correctly shows that the action of studying at university was ongoing in the past before the meeting happened. "Were studying" and "had studied" are incorrect because they do not convey the same meaning as "had been studying".

5. Choose the correct item. 5. Mary had finished checking her emails after the assignment.
Explanation: The correct answer is "had finished" because it indicates a past action that happened before another past event.
Step-by-step solution: To choose the correct item, we need to understand the meaning of the sentence. It talks about two past events - finishing checking emails and the assignment. The correct answer is "had finished" because it correctly shows that the action of finishing checking emails happened before the assignment. "Was finishing" and "had been finishing" are incorrect because they do not convey the same meaning as "had finished".

6. Choose the correct item. 6. At 7 o'clock yesterday, he was surfing the net.
Explanation: The correct answer is "was surfing" because it indicates a past continuous action that was happening at a specific time in the past.
Step-by-step solution: To choose the correct item, we need to understand the meaning of the sentence. It talks about a specific time in the past - 7 o'clock yesterday - and the action of surfing the net. The correct answer is "was surfing" because it correctly shows that the action was happening at that specific time. "Surfed" and "had surfed" are incorrect because they do not convey the same meaning as "was surfing".

7. Choose the correct item. 7. They went to the theatre last night.
Explanation: The correct answer is "went" because it indicates a past event of going to the theatre.
Step-by-step solution: To choose the correct item, we need to understand the meaning of the sentence. It talks about a past event of going to the theatre. The correct answer is "went" because it correctly conveys this past event. "Had gone" and "were going" are incorrect because they do not convey the same meaning as "went".

8. Choose the correct item. 8. When Ryan was four, he was composing his own music.
Explanation: The correct answer is "was composing" because it indicates a past continuous action that was happening at a specific time in the past.
Step-by-step solution: To choose the correct item, we need to understand the meaning of the sentence. It talks about a specific time in the past - when Ryan was four - and the action of composing his own music. The correct answer is "was composing" because it correctly shows that the action was happening at that specific time. "Composed" and "had been composing" are incorrect because they do not convey the same meaning as "was composing".

9. Choose the correct item. 9. They took the wrong bus and ended up in a remote village.
Explanation: The correct answer is "took" because it indicates a past event of taking the wrong bus.
Step-by-step solution: To choose the correct item, we need to understand the meaning of the sentence. It talks about a past event of taking the wrong bus and ending up in a remote village. The correct answer is "took" because it correctly conveys this past event. "Used to take" and "was taking" are incorrect because they do not convey the same meaning as "took".

10. Choose the correct item. 10. They got lost in the forest because they hadn't taken a compass with them.
Explanation: The correct answer is "hadn't taken" because it indicates a past event of not taking a compass.
Step-by-step solution: To choose the correct item, we need to understand the meaning of the sentence. It talks about a past event of not taking a compass and getting lost in the forest. The correct answer is "hadn't taken" because it correctly conveys this past event. "Hadn't been taking" and "didn't use to take" are incorrect because they do not convey the same meaning as "hadn't taken".

11. Choose the correct item. 11. What time did the concert start last night?
Explanation: The correct answer is "did" because it indicates a past event in question form.
Step-by-step solution: To choose the correct item, we need to understand the meaning of the sentence. It asks about the start time of the concert in the past. The correct answer is "did" because it correctly forms a question about a past event. "Do" and "does" are incorrect because they do not convey the same meaning as "did".

12. Choose the correct item. 12. It began to rain while they were going to the opera.
Explanation: The correct answer is "were going" because it indicates a past continuous action that was happening at a specific time in the past.
Step-by-step solution: To choose the correct item, we need to understand the meaning of the sentence. It talks about a specific time in the past - while they were going to the opera - and the action of rain beginning. The correct answer is "were going" because it correctly shows that the action of going to the opera was happening at that specific time. "Had gone" and "went" are incorrect because they do not convey the same meaning as "were going".

13. Choose the correct item. 13. He used to work as an usher at a theatre.
Explanation: The correct answer is "used to" because it indicates a past habit or routine.
Step-by-step solution: To choose the correct item, we need to understand the meaning of the sentence. It talks about a past habit of working as an usher at a theatre. The correct answer is "used to" because it correctly expresses this past habit. "Use" and "use to" are incorrect because they do not convey the same meaning as "used to".

14. Choose the correct item. 14. They took pictures of the artifacts yesterday.
Explanation: The correct answer is "took" because it indicates a past event of taking pictures.
Step-by-step solution: To choose the correct item, we need to understand the meaning of the sentence. It talks about a past event of taking pictures of the artifacts yesterday. The correct answer is "took" because it correctly conveys this past event. "Used to take" and "were taking" are incorrect because they do not convey the same meaning as "took".

15. Choose the correct item. 15. He was afraid because he had seen a ghost.
Explanation: The correct answer is "had seen" because it indicates a past action that happened before another past event.
Step-by-step solution: To choose the correct item, we need to understand the meaning of the sentence. It talks about two past events - being afraid and seeing a ghost. The correct answer is "had seen" because it correctly shows that the action of seeing a ghost happened before being afraid. "Had been seeing" and "was seeing" are incorrect because they do not convey the same meaning as "had seen".