I think the answer is B. :)
Answer:
He might write a book/ is writing a book (is or be writing ?)
4/ He might he have writen this book (writen or wrote ?) / he might he has been writing when...
5/ It may rain/ it may be raining/ it may have rain / it may has been raining
Explanation:
A is the correct answer
good luck
It is a Adjective Phrase :)
