正在进行时be+doing怎么加 最好举上例子

题目

正在进行时be+doing怎么加 最好举上例子

答案

现在进行时be动词为am,is,are, 在其后加动词ing形式,例如：I am watching TV.She is doing her homework. They are having lunch.
过去进行时be动词为was,were,然后加动词ing形式,例如：I was watching TV at this time of yesterday.She was doing her homework at that time.