Today, while I was doing my grammar exercises I found an unusual answer in the answer key . I am working on passive structure. In one of the exercises the books says that the correct answer is:
the boat hit a rock and sank quickly.
but i think the correct answer is:
the boat hit a rock and was sunk quickly.
because I think it can't sink by itself! I mean, if I say " I sank something" it means I did it in the past! In this case this sentences mean the boat sank another thing!
What do you think ?
The book I referred to: Grammar in Use (Raymond Murphy-third edition)