Rewrite the sentences

2. I’m sure that Ethan didn’t go to the cinema yesterday.
Ethan __ gone to the cinema yesterday.
3. Perhaps David didn’t notice you.
David __ noticed you.
4. It was a bad idea for us to be rude to the policeman!
We _been rude to the policeman!
5. It wasn’t necessary for me to buy any food yesterday.
I any food yesterday.