加入 used to 並改寫句子： 1. William is a great actor. 2. There are many cute animals here. 3. Mary does not have dinner at home. 4. Do you go to school by bus?
- William used to be a great actor.
- There used to be many cute animals here.
- Mary used to not have dinner at home.
- Did you use to go to school by bus?
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