词组 | be able to(can) |
释义 | able , be-to : can-1 1a. 用于陈述结构, be able to 这个复合助动词含有“使之能够”或“得以”的意思,相当于 manage to do 的意思(参见词条 P.2 );因此,该用它的场合,不宜改用 can 这个情态动词,除非是用于否定结构。 例如: Hob studied very hard, and was able to pass his examination. 霍勃读书很用功,能够考得上。(最好不说… and could pass his examination ) We had a holiday yesterday and so we're able to return home once again. 昨天我们放假,所以得以再回家一次。(最好不说… and so could return home …) 比较: Hob studied very hard, and was able to pass his examination. 霍勃读书很用功,能够考得上。(肯定句要用 was able to ) Hob studied very hard, but wasn't able to / couldn't pass his examination. 霍勃读书很用功,但未能考上。(否定句两者可以通用) 1b. 用于否定结构, be able to 表达一时情况,而 can 则表达经常情况,等于 be incapable of 的用法。 例如: Margaret is not able to swim today. 玛格丽特今天不能游泳。 Margaret can't swim at all. 玛格丽特根本不会游泳。 I shall not be able to go to school tomorrow. 我明天不能去上学了。 I have been incapable of going to school tomorrow since then. 从那时起,我就一直不能去上学。 |
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