机关竞聘演讲稿:英语中什么是助动词?
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帮助动词,在句子中只起结构,时态, 语态上的作用,一般无实义。
eg: Do you know him?
do 只是起到结构上的作用,无义。
He is working over there.
is 是助动词,起到时态的作用。
DO DOES
do did does done
have had
帮助动词,在句子中只起结构,时态, 语态上的作用,一般无实义。
eg: Do you know him?
do 只是起到结构上的作用,无义。
He is working over there.
is 是助动词,起到时态的作用。
DO DOES
do did does done
have had