发布网友 发布时间:2023-05-01 15:46
共1个回答
热心网友 时间:2023-10-12 11:05
be动词的别称: 连系动作,助动词 ,它有人称、时态和数的影响
作为连系动词时后跟形容词或名词作表语
用于进行时态和被动语态中时是作助动词
如
He is very happy .(is 是系动词)
他很开心。
We are students. (are 是系动词)
我们是学生。
Jim is doing his homework now.( is是助动词)
吉姆现在正在做作业。
They were playing basketball at four yesterday afternoon.(were是助动词) 他们昨天四点钟时在打篮球。
English is spoken by them . (is 是助动词)
他们说英语。