be动词能可以和实义动词一同出现.比如：
I am doing my homework.
助动词能和实义动词一同出现,比如：
Do you have a book?
助动词和be动词也可以同时出现,比如：
I have been learning English for ten years.
have 是助动词,been 是be的过去分词形式.
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