关于can / could后接不式的用法分析That day Mr Smith got up late, so he ran as fast as he could _________ the early bus.A. catch B. to catchC. catching D. caught【分析】此题容易误选A，认为情态动词后只能接动词原形。但是，错了，正确的答案是B。其实情态动词 could 后本来有动词原形 run，只是被省略了，即此句的完整形式应是 …so he ran as fast as he could run to catch the early bus，其中的不定式 to catch the early bus 为目的状语。又如：(1) My parents did what they could _________ my aunt and uncle.A. help B. to helpC. helping D. helped(2) He read what he could _________ his knowledge.A. widenB. to widenC. wideningD. widened以上两题均选B，即选不定式，且此不定式为目的状语。但是，同学们若据此形成思维定势，也会麻烦。为此，请再看两题：(1) He ran as fast as he could _________to catch the bus.A. hope B. to hope C. hoping D. hoped 【分析】此题的最佳答案不是B，而是C，其中的现在分词短语 hoping to catch the bus 用作伴随状语，即一边跑一边在希望能赶上早班车。(2) He spent every minute he could _________ foreign languages.A. study B. to study C. studying D. studied【分析】此题也应选C，但是，它与上题选现在分词 hoping 表伴随有所不同，此题的 studying 其实与其前的动词 spend 有关，即此句中的 studying 为动名词，其前省略了介词 in。注意spend 的句型：spend + 时间或金钱 + (in) doing sth。

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