| 单词 | can(be able to) |
| 释义 | can ： be able to — 194 1a. 由于 can 这一助动词没有完成式和将来式，在需用这两种时态的时候，往往改用后者这个复合助动词来代替（参见词目 195 ）；甚至一般过去时态也用它来代替，不用 could （注：因为 could 含有情态色彩）。 例如： We have been able to produce new-devised sewing machines. 我们已能生产新设计的缝纫机了。（用于现在完成时态） They were able to quicken their steps towards achieving theobjective. 他们已经能够朝着目标加快步伐了。（用于一般过去时态） Shall you be able to come tomorrow? 你明天能来吗？（ =Will it be possible for you to come tomorrow? ） 1b. 用于一般陈述结构，后者含有“使之能干”或“得以”的义蕴，相当于 manage to do 的意思；因此，也不宜使用 can ／ could 。——当然，用于否定的陈述结构则不在此限。 例如： He studied very hard, and was able to pass his examination. 他读书很用功，所以能够考得上。（不说… could pass his examination ） We had holidays yesterday and so were able to return home again. 我们昨天放假，所以得以再回家一次。（也不说… and so could return home again ） 比较： He studied very hard, but wasn't able to/couldn't pass hisexamination. 他读书很用功，但考试没考上。（用于否定句，两者可以通用） He studied very hard, and was able to pass his examination. 他读书很用功，所以能够考得上。（用于肯定句，不能改用 could ） |
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