一般来说.不定式表示在谓语动词之后发生的动作,表示未完成的动作。改为定语从句常用将来时态;现在分词表示正在进行的动作或与谓语动词几乎同时发生的动作,改为定语从句多用进行时态或一般时态;过去分词表示先于谓语动词发生的动作,改为定语从句多用完成时态;动名词则表示所修饰词的用途,不能改为定语从句,常用“(use)for doing”的形式作后置定语。现举例如下: He has a fishing rod.—a rod for fishing(动名词) He has two letters to write-一letters which will write.(不定式) The teacher standing there will gave us a report.一the teacher who is standing there will gave us a report…(现在分词) ’they’re problems left over by history.一they’re problems which have been left by history过去分词)
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