第5讲 情态动词和虚拟语气 情态动词 [深化认知] 一、情态动词的基本用法 1.表示能力(can/could/be able to) 表现在的或一般的能力,can与be able to的用法一样,但后者不常用;表将来的能力用will be able to;表示过去一般的能力用could,表示过去有能力并且成功地做了某事用was/were able to,相当于managed to do sth./succeeded in doing sth.。 The man can/could speak two foreign languages. 那个人能说两门外语。 Do you believe that Mozart could play the piano at the age of three? 你相信莫扎特在三岁时就会弹钢琴吗? The fire spread through the building very quickly but everyone was able to get out. 尽管这场大火很快蔓延到整个大楼,但是每个人都逃出去了。 [名师指津] 如何区分can和be able to ①can在时态上只有现在时和过去时两种,而be able to则有更多的时态。 ②be able to强调“通过努力有能力做到”,如果表示“某事已经成功做成”应用was/were able to,而不用could。 ③用在其他动词,如might, may, would, want, hope等之后表示能力只能用be able to。 Tom may be able to pass the exam by studying hard from now on. |