(二)主语:主语是一个句子所叙述的主体,一般位于句首。但在there be结构、疑问句(当主语不疑问词时)和倒装句中,主语位于谓语、助动词或情态动词后面。主语可由名词、代词、数词、不定式、动名词、名词化的形容词和主语从句等表示。例如:
During the 1990s, American country music has become more and more popular.(名词)
We often speak English in class.(代词)
One-third of the students in this class are girls.(数词)
To swim in the river is a great pleasure.(不定式)
Smoking does harm to the health.(动名词)
The rich should help the poor.(名词化的形容词)
When we are going to have an English test has not been decided.(主语从句)
It is necessary to master a foreign language.(it作形式主语,真正的主语为后面的不定式)
(三)谓语:谓语说明主语所做的动作或具有的特征和状态。动词在句中作谓语,一般放在主语之后。谓语的构成如下:
1、简单谓语:由一个动词或动词短语构成。如:He practices running every morning.
2、复合谓语:(1)由情态动词或其他助动词加动词原形构成。如:You may keep the book for two weeks. He has caught a bad cold. (2)由系动词加表语构成。如:We are students.
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2016-02-29
2016-02-29
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