GRAMMAR 1 Complete the sentences with used to / didn’t use to / Did … use to, or the present simple + usually. Example: I used to behave (behave) badly at school, but now I study hard.
1 I (not / like) Cathy much, but now we get on really well.
2 I (go) to the cinema on Mondays, as it is cheaper on that day.
3 I (be) a sales manager, but then I trained to be a designer.
4 When we were children, we often (go) swimming in the sea. 5 (you / work) in the Union Street office before you came here?
6 Jumila (not / be) so quiet. She must be tired today.

2 Underline the correct word(s).
Example: You won’t pass the exam, unless / if you study harder.
1 This is an urgent message. Please call me as soon as / if you get home. 2 You won’t get there on time unless / if you don’t leave work early.
3 He won’t go if / unless Belinda goes, because he can’t drive.
4 Don’t eat anything now! Wait until / when dinner’s ready.
5 They said they’d phone us as soon as / until their plane lands.

3 Complete the sentences with the correct form of the verbs.
Example: If we had arrived (arrive) earlier, we would have got better seats.
1 If I were you, I (buy) a more reliable car.
2 If they (not pass) their exams, they’ll be so disappointed.
3 We wouldn’t help you if we (not want) to.
4 If I (have) better qualifications, I could be a teacher.
5 He (not do) such a dangerous job unless he enjoyed it.
6 I (buy) you a present if you are good.
7 If you (not ask) for a pay rise, you won’t get one.
8 I (not complain) if I had their lifestyle!
9 His teacher won’t be angry if he (tell) her the truth.

Sure! Here are the answers to the grammar exercises:

1)
1. didn't use to like - The use of "didn't use to" indicates a past habit or state that no longer exists. In this case, it means that the speaker didn't like Cathy in the past, but now they get along well.
2. used to go - "Used to" is used to describe past habits or states. In this sentence, it means that the speaker had the habit of going to the cinema on Mondays in the past.
3. used to be - Again, "used to" indicates a past state or habit. Here, it means that the speaker's previous job was a sales manager, but they later became a designer.
4. used to go - Same as sentence 2, "used to" is used to describe a past habit. The speaker and some other people used to go swimming in the sea when they were children.
5. Did you use to work - This is a question asking about a past habit or state. It asks if the person worked in the Union Street office before coming to the current place.
6. didn't use to be - Once again, "didn't use to" describes a past state or habit. It implies that Jumila was not so quiet in the past, but she must be tired today.

2)
1. if - We use "if" to express a condition that needs to be fulfilled in order for the main action to happen. In this case, the person needs to call as soon as they get home.
2. unless - "Unless" is used to express the negative condition that needs to be met for the main action to happen. So, if the person doesn't leave work early, they won't get there on time.
3. if - In this sentence, the condition is that Belinda has to go in order for him to go because he can't drive. So, if Belinda goes, he will go, too.
4. until - "Until" is used to express the time or condition that needs to be fulfilled before the main action can take place. Here, the person needs to wait until dinner is ready before eating.
5. as soon as - "As soon as" is used to indicate that the action will happen immediately after a certain event. In this case, they will phone as soon as their plane lands.

3)
1. would buy - This is a conditional sentence in the present. "If I were you" introduces a hypothetical situation, and the speaker would buy a more reliable car in that case.
2. don't pass - This is a first conditional sentence. It is used to describe a possible future action. If they don't pass their exams, they will be disappointed.
3. didn't want - This is a second conditional sentence. It expresses an unreal or hypothetical condition and its probable result. If they didn't want to help, the speaker wouldn't help them.
4. had - This is a third conditional sentence. It describes an unreal situation in the past and its probable result. If the speaker had better qualifications in the past, they could have been a teacher.
5. wouldn't do - This is a second conditional sentence. It describes an unreal or hypothetical condition and its probable result. If he didn't enjoy the dangerous job, he wouldn't do it.
6. would buy - This is a conditional sentence in the present. If the person is good, the speaker would buy them a present.
7. don't ask - This is a first conditional sentence. If the person doesn't ask for a pay rise, they won't get one.
8. wouldn't complain - This is a second conditional sentence. If the speaker had their lifestyle, they wouldn't complain.
9. tells - This is a first conditional sentence. If he tells the truth, his teacher won't be angry.

I hope these explanations provide a clear understanding of the grammar exercises. Let me know if you have any further questions!