Did Jane cut the grass yesterday ? Yes , she did .
Did Peter write a letter yesterday ? No , he didn't.
Did Peter meet his friends yesterday ? Yes , he did .
Did Pam and Ban write a letter yesterday ? No , they didn't .
Did Pam and Ben meet their friends ? Yes , they did.
Did Ann write a letter yesterday ? No , she didn't .
Did you cut the grass yesterday ? Yes , I did .
Did you write a letter yesterday ? No , I didn't .