IV. Put the verbs in brackets in the Present Perfect, Past Perfect or Future Perfect Tense.
1. I just (to buy) a new phone.
2. You ever (to be) to London?
3. She (not to watch) this film yet.
Tom (to retum) from the cinema by five oclock vesterday.
When the mother came home, we (not to do) our homework yet.
6. You (to write) a letter by 5 o'clock yesterday?
7. I (to come) by 5 o'clock tomorrow.
8. Mother (not to cook) dinner when we come home.
9. They (to build) a new house by the end of the year?​

1. I have just bought a new phone. (Present Perfect Tense)
Explanation: The verb "to buy" is in the simple past form, but we need to use the present perfect tense because the action of buying a new phone is connected to the present moment. "Just" emphasizes that the action happened very recently.

2. Have you ever been to London? (Present Perfect Tense)
Explanation: The verb "to be" is in the simple past form, but we need to use the present perfect tense because the action of visiting London is connected to the present moment. "Ever" suggests that we are talking about all past experiences up until now.

3. She has not watched this film yet. (Present Perfect Tense)
Explanation: The verb "to watch" is in the simple past form, but we need to use the present perfect tense because the action of watching the film is connected to the present moment. "Yet" indicates that the action has not happened up until now.

4. Tom had returned from the cinema by five o'clock yesterday. (Past Perfect Tense)
Explanation: The verb "to return" is in the simple past form, but we need to use the past perfect tense because the action of returning from the cinema is completed before another past event (five o'clock yesterday). "By" indicates the completion of the action before the specified time.

5. When the mother came home, we had not done our homework yet. (Past Perfect Tense)
Explanation: The verb "to do" is in the simple past form, but we need to use the past perfect tense because the action of doing our homework is completed before another past event (the mother coming home). "Yet" indicates that the action has not happened up until that past moment.

6. Did you write a letter by 5 o'clock yesterday? (Simple Past Tense)
Explanation: The verb "to write" is in the simple past form, and we should use the simple past tense here because the action of writing the letter is completed in the past. "By" indicates the deadline by which the action needed to be completed.

7. I will come by 5 o'clock tomorrow. (Future Perfect Tense)
Explanation: The verb "to come" is in the simple present form, but we need to use the future perfect tense because the action of coming is completed in the future. "By" indicates the completion of the action before the specified time.

8. Mother will not have cooked dinner when we come home. (Future Perfect Tense)
Explanation: The verb "to cook" is in the simple present form, but we need to use the future perfect tense because the action of cooking dinner is completed before another future event (we come home). Negation "not" is added before "have" to indicate the action will not be completed.

9. Will they have built a new house by the end of the year? (Future Perfect Tense)
Explanation: The verb "to build" is in the simple present form, but we need to use the future perfect tense because the action of building a new house is completed before another future event (the end of the year). "By" indicates the completion of the action before the specified time.