Question

please check my answers​

Answer 1

90%is right and some mistakes

1. has=had
2. 4 is incorrect

Answer 2

Answer:

Well, when you convert active sentences of present perfect in passive then you have to use 'has been' instead of has.

for example- the book has been read by him

Explanation:

for plural you will use "have " and for singular you will use "has"