Complete the sentences using Future Perfect.
1. I __ (leave) by seven.
2. __ (you/finish) the project by the deadline?
3. He __ (finish) his exams by then, so we can go the cinema.
4. She __ (not/finish) work by six.
5. __ (you/do) everything by ten?
6. __ (they/arrive) by the time it gets dark?
7. How long __ (you/be) in this company by the time you retire?
8. By this time tomorrow, I __ (finish) the website.
9. By 9 o'clock, the kids __ (fall) asleep.
10. Ivan __ (clean) the entire house by dinner.

1. I will have left by seven.
Explanation: In this sentence, we are talking about a future action (leaving) that will be completed before a specific point in the future (by seven o'clock).

2. Will you have finished the project by the deadline?
Explanation: This question is asking about a future action (finishing the project) that will be completed before a specific point in the future (the deadline). The use of "will" indicates a future action, and "have finished" indicates completion before the deadline.

3. He will have finished his exams by then, so we can go to the cinema.
Explanation: In this sentence, we are talking about a future action (finishing exams) that will be completed before a specific point in the future (by then). The use of "will" indicates a future action, and "have finished" indicates completion before going to the cinema.

4. She will not have finished work by six.
Explanation: In this sentence, we are talking about a future action (finishing work) that will not be completed before a specific point in the future (by six o'clock). The use of "will not have" indicates that the action will not be completed before the specified time.

5. Will you have done everything by ten?
Explanation: This question is asking about a future action (doing everything) that will be completed before a specific point in the future (by ten o'clock). The use of "will" indicates a future action, and "have done" indicates completion before ten o'clock.

6. Will they have arrived by the time it gets dark?
Explanation: This question is asking about a future action (arriving) that will be completed before a specific point in the future (by the time it gets dark). The use of "will" indicates a future action, and "have arrived" indicates completion before it gets dark.

7. How long will you have been in this company by the time you retire?
Explanation: This question is asking about the duration of a future action (being in this company) that will be completed before a specific point in the future (retirement). The use of "will" indicates a future action, and "have been" indicates completion by the time of retirement.

8. By this time tomorrow, I will have finished the website.
Explanation: In this sentence, we are talking about a future action (finishing the website) that will be completed before a specific point in the future (by this time tomorrow). The use of "will" indicates a future action, and "have finished" indicates completion by the specified time.

9. By 9 o'clock, the kids will have fallen asleep.
Explanation: In this sentence, we are talking about a future action (falling asleep) that will be completed before a specific point in the future (by 9 o'clock). The use of "will" indicates a future action, and "have fallen" indicates completion before 9 o'clock.

10. Ivan will have cleaned the entire house by dinner.
Explanation: In this sentence, we are talking about a future action (cleaning the entire house) that will be completed before a specific point in the future (by dinner). The use of "will" indicates a future action, and "have cleaned" indicates completion before dinner.