| 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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