be動詞的用法總結及練習題(2)
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be動詞的用法：做助動詞
助動詞be 有兩個基本用法，一是與謂語動詞一起構成各種時態(tài)，二是構成被動語態(tài)。
1、“be + 現(xiàn)在分詞組”成各種進行式時態(tài)。例如：
Tony's maid is washing his new car.
The children are playing in the field.
Samuel was eating when I came in.
We have been living here since 1959.
This time next day they will be sitting in the cinema.