There wasn't a boy in the garden yesterday. сделать утвердительную форму

There was a boy in the garden yesteray.

1. how can i help you?

2. do you have warm mittens?

3. of course. do you have white and blue scarves?

4. how much does it cost?

a - have been

b - have not had. saw 

a - was

b - left. came. have found/