be动词的用法总结及练习题(2)

　　be动词的用法：做助动词

学习啦在线学习网 　　助动词be 有两个基本用法，一是与谓语动词一起构成各种时态，二是构成被动语态。

学习啦在线学习网 　　1、“be + 现在分词组”成各种进行式时态。例如：

学习啦在线学习网 　　Tony's maid is washing his new car.

　　The children are playing in the field.

　　Samuel was eating when I came in.

学习啦在线学习网 　　We have been living here since 1959.

　　This time next day they will be sitting in the cinema.