Look at the dirty trousers.(改为否定句)
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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?