Question

V) I (finished/have finished/had finished) my homework before I had dinner.
vi) She (reached/has reached/had reached) home before the guests arrived.
vii) He thanked me for what I (am doing/have been doing/had done).
viii) Uncle (is leaving had left/has left) when I returned.
ix) When they reached the theatre the play (started/was starting had already
started).
x) I have not received/do not receive/had not received) a letter from him yet.
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Answer 1

V) I (finished/have finished/had finished) my homework before I had dinner.

= I had finished my homework before I had dinner.

vi) She (reached/has reached/had reached) home before the guests arrived.

=She had reached home before the guests arrived.

vii)He thanked me for what I (am doing/have been doing/had done).

=He thanked me for what I had done.

viii) Uncle (is leaving had left/has left) when I returned.

=Uncle had left when I returned.

ix) When they reached the theatre the play (started/was starting had already started).

= When they reached the theatre the play had already started.

x) I (have not received/do not receive/had not received) a letter from him yet.

= I received a letter from him yet.

_________________________

Extra Info...

•Tense describes us about time.

•Tense is always in present,past and future.

• Present tense describes us that things happing in present.
• Past tense describes us that things already happened in past.
• Future tense describes us that things will happen in future.

Answer 2

I finished my homework before i had dinner
2. She reached home before the guests arrived
3.uncle had left when I returned
4.when they reached the theatre the play had already started
5.I have not received a letter from him yet