2022年初中英语表示期限等用by,until,till
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表示期限等用by,until,till (1) by:在……前(时间);截至(到)…… 注意:由until(till)形成的句子,句中的动词如果是点动词,则必须用否定句。 How many English books had you read by the end of last year?到去年年底以前你看过多少本英文书? (2)until(till):直到……为止(时间) 比较by和until by seven o'clock截至(到)7点钟(一般和完成时连用) until seven o'clock直到7点(7点以前) We didn't begin to watch TV until(till) nine o'clock.(begin是点动词,所以用否定式)一直到九点,我们才开始看电视。 I'll wait for him until he comes here.我将在这儿一直等到他来。(wait是延续动词,用肯定式) 注意:until和till可以通用。它们可以作连词(见上例)而by不能作连词。 (责任编辑:admin) |