一、不定式、分词、动名词作表语的比较。请看例句:
①My job is to teach the students English.
②My job is teaching the students English.
③My job is interesting.
④I am interested in English.
辨析比较:A. ①不定式与动名词作表语一般可以互换使用,在意义上没有多大差别,且其形式差异较大,很容易把握, 如上面例句的①②;②现在分词和动名词同形,在作表语时,学生不易识别。分辨方法有三:
a)分词作表语说明主语的性质特征,回答how的问题;不定式和动名词作表语则说明主语的内容,回答what 或 doing what 问题, 如: My job is interesting.(=How is my job?) ; My job is teaching ( to teach ) the students English. (=What is my job?);
b)动名词具有名词的句法功能,也能做主语,我们不妨把句中的表语转换成主语,如果句子成立,则是动名词作表语,否则是现在分词作表语。如:My job is teaching the students EnglishTeaching the students English is my job.显然句子是成立的,原句中的teaching是动名词;
c)分词具有形容词的句法功能,那么,我们可以在作表语的分词前加very(extremely ,fairly ) 等副词,如果句子成立,则动词-ing 形式作表语的是现在分词。如上面例句:My job is interesting. 可改为:My job is very interesting. 显然句子是成立的,句中的interesting 是现在分词。
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