be動(dòng)詞的用法總結(jié)及練習(xí)題(2)
時(shí)間：
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be動(dòng)詞的用法：做助動(dòng)詞
助動(dòng)詞be 有兩個(gè)基本用法，一是與謂語(yǔ)動(dòng)詞一起構(gòu)成各種時(shí)態(tài)，二是構(gòu)成被動(dòng)語(yǔ)態(tài)。
1、“be + 現(xiàn)在分詞組”成各種進(jìn)行式時(shí)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.