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英语助动词的口诀

发表时间：2024-08-01 22:07:31 来源：网友投稿

新添助动词很重要，时态人称一肩挑，句型转换打头阵，谓语还原要记牢。

一般问句两法变：

一是把它提向前，或者句首do来添。否定句子也一样，就看not怎么放。be.have.do都可用作助动词：

1. be可构成进行时态、被动语态和复合谓语：She is writing a novel.她在写小说。（进行时态）The case is being investigated.这案子正在调查。（被动语态）How are you to explain all this?这一切你怎么解释？（复合谓语）2.have可构成完成时态和完成进行时态：She had been out shopping.她出去买东西了。（完成时态）They have set up a network of financial advice centers.他们建立了一个金融咨询中心网。（完成时态）She has been doing some research work.她一直在做研究工作。（完成进行时）That was the letter we'd (had)been expecting.这正是我们在期待的信。（完成进行时）3.do 可构成疑问句、否定句，用于强调或代表前面动词以避免重复：When did she get there?她什么时候到的？（疑问句）He doesn't know anything about it.他对此一无所知。（否定句）Do stay for a couple more days.务请再待两三天。（强调）He speaks English better than I do.他英文讲得比我好。（代表前面动词

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