來源:網(wǎng)絡(luò)資源 2023-01-09 18:51:52
助動(dòng)詞
助動(dòng)詞本身沒有意義,只能和主要?jiǎng)釉~一起構(gòu)成各種時(shí)態(tài)、語態(tài)、語氣等動(dòng)詞形式,表示否定,疑問等結(jié)構(gòu)中的謂語動(dòng)詞。常用的助動(dòng)詞有:shall, will.have, should, would, do, be等。
I don't know where he is.(否定句)Do you have a dictionary with you? (疑問句)I have been to Shanghai twice.(現(xiàn)在完成時(shí))There will be a meeting tomorrow morning.(一般將來時(shí))
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