do与be的用法 |
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an hour of sport every day. ③ She did her homework at home last night.
④ Mother was doing the cooking when I reached home.
⑤
Have you done the exercises yet?
2.
do 作助动词时, 只有 do, does, did 三种形式, 无词义, 限用于含行为动词的一般现在时 和一般过去时两种时态的否定句和疑问句中。如:
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