Formation of the Future Perfect in the Past
#1. The Future Perfect in the Past is formed by means of the Future Indefinite in the Past of the auxiliary verb to have and Participle II of the notional verb.
#2. In the interrogative form, the first auxiliary verb is placed before the subject. And in the negative form, the negative particle not is placed after the first auxiliary verb.
| Affirmative | Interrogative | Negative |
|---|---|---|
| I should have worked He would have worked She would have worked We should have worked You would have worked They would have worked |
Should I have worked? Would he have worked? Would she have worked? Should we have worked? Would you have worked? Would they have worked? |
I should not have worked He would not have worked She would not have worked We should not have worked You would not have worked They would not have worked |
#3. The contracted affirmative forms are:
I’d have worked
He’d have worked
The contracted negative forms are:
I shouldn’t have worked
He wouldn’t have worked
#4. The negative-interrogative forms are:
Should I not have worked? = Shouldn’t I have worked?
Would he not have worked? = Wouldn’t he have worked?
Use of the Future Perfect in the Past
The Future Perfect in the Past is used to denote an action completed before a definite moment which was the future from the point of view of the past.
I wondered whether they would have reached the place by noon