帮助构成被动语态的 Trees are planted in spring. (are帮助构成被动语态,没有具体意义,是助动词) The house has been pulled down. (has been帮助构成时态和语态,是助动词)
帮助构成虚拟语气 I wouldn’t have made such a mistake.(had, have帮助构成虚拟语气,是助动词,属于谓语的一部分。)
帮助构成倒装句的 So did he love his mother that he bought her many presents on her birthday. (他如此爱他的母亲以至于他母亲生日那一天,他给她买了许多礼物。did只是帮助构成倒装句,没有具体意义,是助动词)
帮助构成强调意义的 He did come yesterday. (他昨天确实来过。did起强调作用,没有具体意义,是助动词)
因此可以看出,常见的助动词为do, be, have,它们为基本助动词。
一个词既可以作实义动词也可以作助动词,具体是哪一种,主要看它们在句中的功能。
He did his homework at seven o’clock. (did单独作谓语,意为“做”,是实义动词) Did he do his homework yesterday? (did是助动词,帮助构成一般疑问句,do是实义动词,意为“做”,是实义动词。)
He has had breakfast. (has是助动词,帮助构成现在完成时,had是实义动词,意为“吃”。has had一起构成了句子的谓语。)
指出下列斜体单词是实义动词还是助动词:
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