英语语法说到底其实就这3句话，得高分就是这么简单(2)
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b.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 caughta bad cold.
(2)由系动词加表语构成。如：We are students.
在英语中一个简单句只能有一个谓语动词（知道为什么吗），而且，我们平时学习的时态是针对谓语动词来说。
如果以do为例，do, did ,have done, will do, had done, is/am/are doing, was/were doing, would do。在简单句中，谓语动词和主语是句子的核心，是不可以随意删掉的。
3.宾语：宾语表示动作的对象或承受者，一般位于及物动词和介词后面。例如：
They went to see an exhibition（展览）yesterday.（名词）
The heavy rain prevented me from coming to school on time.（代词）
How many dictionaries do you have? I have five.（数词）
They helped the old with their housework yesterday.（名词化形容词）
4.表语：表语用以说明主语的身份、特征和状态，它一般位于系动词（如be, become, get, look, grow, turn, seem等）之后。表语一般由名词、代词、形容词、分词、数词。
Our teacher of English is an American.（名词）
Is it yours?（代词）
The weather has turned cold.（形容词）
The speech is exciting.（分词）
Three times seven is twenty one?（数词）
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