Present and pastunits 1-6, appendix 21. put the verb into the correct  form, present simple (i do), present continuous (i am doing), past simple (i did) or past continuous (i was doing).1. we can go out now. it _isn't raining_ (not/rain) any more.2. ann _was waiting_ (wait) for me when i _arrived_ (arrive).3. i --- (get) hungry. let's go and have something to eat.4. what --- (you/do) in your spare time? have you got any hobbles? 5. what speed --- (the car/do) at the time of the accident? 6. mary usually --- (phone) me on fridays but she (not/phone) last friday.7. a: when i last saw you, you --- (think) of moving to a new flat.b: that's right, but in the end i --- (decide) to stay where i was.8. what's that noise? what --- (happen)? 9. it's usually dry here at this time of the year. it --- (not/rain) much.10. yesterday evening the phone --- (ring) three times while we --- (have) dinner.11. linda was busy when we --- (go) to see her yesterday. she (study) for an exam. we --- (not/want) to disturb her, so we --- (not/stay) very long.12. when i first --- (tell) tom the news, he --- (not/believe) me. he --- (think) that i --- (joke).​

1. we can go out now. it _isn't raining_ (not/rain) any more.
- In this sentence, we use the present continuous tense ("isn't raining") to describe a current action happening at the moment of speaking. The verb "rain" is in the -ing form because it's used in the present continuous tense.

2. ann _was waiting_ (wait) for me when i _arrived_ (arrive).
- In this sentence, we use the past continuous tense ("was waiting") to describe an ongoing action that was happening in the past. The verb "wait" is in the -ing form because it's used in the past continuous tense. We also use the past simple tense ("arrived") to describe a completed action in the past.

3. i --- (get) hungry. let's go and have something to eat.
- In this sentence, we need to fill in the blank with the correct form of the verb "get" based on the context. Since the sentence is in the present tense and the verb "get" refers to a general state or action, we use the present simple tense ("get").

4. what --- (you/do) in your spare time? have you got any hobbies?
- In this sentence, we need to fill in the blank with the correct form of the verb "do" based on the context. Since the question is asking about a general action or habit in the present, we use the present simple tense ("do").

5. what speed --- (the car/do) at the time of the accident?
- In this sentence, we need to fill in the blank with the correct form of the verb "do" based on the context. Since the question is asking about a specific action (speed) in the past, we use the past simple tense ("did").

6. mary usually --- (phone) me on fridays but she (not/phone) last friday.
- In this sentence, we use the present simple tense ("usually phone") to describe a repeated action or habit. However, we use the past simple tense ("did not phone") to show that this action did not happen in the past.

7. a: when i last saw you, you --- (think) of moving to a new flat.
b: that's right, but in the end i --- (decide) to stay where i was.
- In these sentences, we use the past simple tense ("you thought" and "I decided") to describe completed actions in the past.

8. what's that noise? what --- (happen)?
- In this sentence, we need to fill in the blank with the correct form of the verb "happen" based on the context. Since the question is asking about a current action happening at the moment of speaking, we use the present continuous tense ("is happening").

9. it's usually dry here at this time of the year. it --- (not/rain) much.
- In this sentence, we use the present simple tense ("it doesn't rain") to describe a general fact, habit, or state. The negative form "doesn't" indicates the absence of the action or state.

10. yesterday evening the phone --- (ring) three times while we --- (have) dinner.
- In this sentence, we use the past simple tense ("the phone rang") to describe a specific action in the past. We also use the past continuous tense ("we were having") to describe an ongoing action that was happening in the past.

11. linda was busy when we --- (go) to see her yesterday. she (study) for an exam. we --- (not/want) to disturb her, so we --- (not/stay) very long.
- In these sentences, we use the past simple tense ("we went") to describe a completed action in the past. We use the past continuous tense ("she was studying") to describe an ongoing action happening in the past. We also use the negative past simple tense ("we didn't want") and negative past continuous tense ("we weren't staying") to indicate the absence of the actions.

12. when i first --- (tell) tom the news, he --- (not/believe) me. he --- (think) that i --- (joke).
- In these sentences, we use the past simple tense ("I first told") to describe a completed action in the past. We also use the negative past simple tense ("he didn't believe") and past continuous tense ("he was thinking") to indicate the absence and ongoing action in the past. The verb "joke" is in the -ing form ("I was joking") because it's used in the past continuous tense.