Exercise 1. Present Perfect или Present Perfect Continuous.
1.I think the waiter (forget) us. We (wait) here for over.
2. Have you got any plaster? I (chop) potatoes for lunch and I (cut) my finger.
3. What you (do)? You’re covered in flour.
4. I (wash) the windows, I (sweep) up the leaves, but I (not wash) the dishes yet.
5. I can’t find her anywhere; I (look) for her for about 13 minutes
6. I (decide) to move to Glasgow! I (think) about it for a long time.
7. They (already/repair) the roof.
8. She (not clean) the staff room yet.
9. It (snow). The garden’s all white.
10. Harry’s skin hurts because he (sit) on the beach for six hours.

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Exercise 1:
1. I think the waiter has forgotten us. We have been waiting here for over.
Explanation: We use the Present Perfect Continuous tense here to show that the action of waiting started in the past and is still ongoing in the present.

2. Have you got any plaster? I have been chopping potatoes for lunch and I have cut my finger.
Explanation: We use the Present Perfect Continuous tense for actions that started in the past, have a connection with the present, and might continue in the future.

3. What have you been doing? You're covered in flour.
Explanation: We use the Present Perfect Continuous tense to talk about actions that started in the past, have a connection with the present, and might continue in the future.

4. I have washed the windows, I have swept up the leaves, but I haven't washed the dishes yet.
Explanation: We use the Present Perfect tense to talk about completed actions in the past that have a connection with the present.

5. I can't find her anywhere; I have been looking for her for about 13 minutes.
Explanation: We use the Present Perfect Continuous tense to talk about an action that started in the past and is still ongoing in the present.

6. I have decided to move to Glasgow! I have been thinking about it for a long time.
Explanation: We use the Present Perfect Continuous tense to talk about an action that started in the past and is still ongoing in the present.

7. They have already repaired the roof.
Explanation: We use the Present Perfect tense to talk about completed actions in the past that have a connection with the present.

8. She hasn't cleaned the staff room yet.
Explanation: We use the Present Perfect tense to talk about actions that started in the past and are still relevant in the present.

9. It has been snowing. The garden's all white.
Explanation: We use the Present Perfect Continuous tense to talk about an action that started in the past and is still ongoing in the present.

10. Harry's skin hurts because he has been sitting on the beach for six hours.
Explanation: We use the Present Perfect Continuous tense to talk about an action that started in the past and is still ongoing in the present.