为你解答.
Look at the dirty trousers.(改为否定句)
(Don't look) at the dirty trousers.
He went to movies at 7:00 this morning.(就at 7:00 提问)
(What time) did he (go) to movies this morning?
Helen recites poems every morning.(用two years ago改写)
Helen (recited) poems (two years ago).
We had a good time in the zoo last week.(改为否定句)
We (didn't have) a good time in the zoo last week.
They watched a dolphin show yesterday.(就watched a dolphin show提问)
(What did) they (do) yesterday?