|
知识要点:
一、不定式与动名词做主语: 1、动名词做主语往往表示普通的、一般的行为,不定式做主语常表示某次具体的行为。例如: Collecting information about children’s health is his job. 收集有关儿童健康的信息是他的工作。 It’s necessary to discuss the problem with an experienced teacher. 与一位有经验的老师讨论这个问题是有必要的。 2、常用不定式做主语的句型有: (1)It’s difficult (important, necessary) for sb. to do (2)It’s kind (good, friendly, polite, careless, rude, cruel, clever, foolish, brave) of sb. to do. 3、常用动名词做主语的句型有: It’s no good (use, fun) doing. It’s (a) waste of time one’s doing. It’s worth while doing.
二、不定式、动名词、分词做表语: 1、不定式做表语常表示谓语动词所表示动作之后发生的动作。 His teaching aim of this class is to train the students’ speaking ability. 他这节课的教学目的是要训练学生说的能力。 2、动名词做表语是对主语内容的解释,这时主语与表语位置可以互换,动名词常用于口语中。 Its full-time job is laying eggs. 它的(指蚁后)的专职工作是产卵。 3、现在分词做表语表示主语的性质与特征;进行时表示正在进行的动作。 The task of this class is practising the idioms. (现在分词做表语) With the help of the teacher, the students are practising the idioms. (现在进行时) 4、常用作表语的现在分词有:interesting, amusing, disappointing, missing, puzzling, exciting, inspiring, following等。现在分词表示进行与主动。
|