Questions about grammar
1. Mike is among those who _____ from the fire unhurt.
a) had escaped (my answer) b) have escaped (correct answer)
- Isn't that I'm implying the fire still ongoing if I use present perfect in this sentence?
- When to use present perfect & past perfect?

2. _____ our homework, we went out to have a game of football.
a) Having completed (correct answer) b) Completed (my answer)
-When to use -ing? Can't I just use the word 'completed'?

3. Ted seems ______ what was happening before we did.
a) to know (my answer) b) to have known (correct answer)
- Why 'have+past participle' is needed in this sentences?

Question

Questions about grammar
1. Mike is among those who _____ from the fire unhurt.
a) had escaped (my answer)     b) have escaped (correct answer)
-  Isn't that I'm implying the fire still ongoing if I use present perfect in this sentence?
- When to use present perfect & past perfect?

2. _____ our homework, we went out to have a game of football.
a) Having completed (correct answer)     b) Completed (my answer)
-When to use -ing? Can't I just use the word 'completed'?

3. Ted seems ______ what was happening before we did.
a) to know (my answer)     b) to have known (correct answer)
- Why 'have+past participle' is needed in this sentences?

Answer

1. Using "have escaped" you are implaying that he's still alive. He survived the fire.

Answer

1.is~have done
was~had done
2.(After) having done ,,,did,,,
3.to have known~did
to know~do