初三第6单元易混词点拨 |
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中学英语教学资源网 → 英语教案 → 教学设计 手机版 | ||||
作者:王书政 1. ago; before ago和before均表示"以前",都可以在句中作副词,放在表示时间的词语之后。但二者有区别: ago的参照点是"现在",常用于一般过去时;before的参照点是"过去的某个时间点",常用于过去完成时。 以two years ago和two years before为例:前者是指从现在算起的两年前。如: John left a few minutes ago. (以现在为参照点);后者则是指从过去的某一个时间点算起的两年前。 如:He said that he had seen her two years before. (以他说话的那一刻为参照点) 二者若置于一个句子中,其差别就更容易理解了: I visited him two days ago, but he had gone to London five days before. 2. sometime; sometimes; some time; some times sometime是副词,可与过去时或将来时连用,表示"(在过去)某个时候"或"(在将来)某个时候"。如: I saw him sometime in May. I'll buy a new house sometime. sometimes是一个表示时间频率的副词,意为"有时候"。如: Sometimes I help my mother with the housework. some time多数情况下作名词短语,意为"一些时间;一些时候";它还可以作副词词组,用来表示一个未肯定的时刻,此时它可与sometime互换。如: I'll be away for some time. Let's have dinner together some time / sometime next week. some times是"几次、几倍"之意。如: They have been there several times. 3. stop doing; stop to do stop doing sth.是"停止做某事",动词的-ing形式是stop的宾语,指停止正在进行的事情; stop to do sth.是"停下来去做某事",动词不定式作目的状语。如: He stopped talking. (他停止了谈话。) He stopped to talk.(他停下来开始谈话。) 4. when; while; as when, while和as都有"当......之时"之意,区别在于: when从句的谓语动词可以是瞬间性的(get up, arrive, start等),也可以是持续性的(be, stay, wait, live等)。如: It was raining when we started. I lived in this village when I was a boy. while从句中的动词必须是持续性的。当when从句中的动词是持续性动词时,就可以用while来代替when。 as从句强调从句的动作与主句的动作同时进行,可译为"一边......一边......"或"随着......"。如: He sang songs as he was taking a bath. As she grew older, she became more beautiful. |
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