Fortunately, I .... working alone otherwise I would have got really bored at the night shift.
I don't think it was a good idea to intervene, instead, you .... your child to abandon the habit of thumb-sucking gradually, all by himself.
After the voyaging ship was wrecked during a storm at sea, unfortunately, only two of the men on board .... swim to the small island nearby.
I don't know why she didn't ask me how to do it as I ---- her.
Martin ---- my tennis racket without asking my permission. I got really angry with him.
I don't know why Peter is so late; do you think he ---- lost coming here?
What ---- to Phil? He said he ---- here at eight o'clock.
Option (5) can have happened / would be.
One of the US national security advisers ---- there ---- better intelligence sharing before the September 11 attacks.
We all think that Maria ---- an interesting person to meet as we ---- a lot of stories about her so far.
As a young woman who had never given birth before, she ---- what the experience of childbirth ---- like.