We can get there before dark.(肯定)
We cant get thee before dark.(否定)
(2) 如果陈述句的谓语动词是实义动词,而其中又没有情态动词或助动词时,则需根据人称和时态在该实义动词前加dont, doesnt或didnt。同时把该实义动词变为原形。
He plays the violin well.(肯定)
He doesnt play the violin well.(否定)
She won the game.(肯定)
She didnt win the game.(否定)
(3) 如果句子是there be结构或谓语动词是have(有),除了be和have之后加not之外,句中如果有some要变为any。例如:
There is some water in the cup. There is not any water in the cup.
He has some books. He has not any books.
(4) 除not以外,否定词no, never, nothing, nobody, few等也可构成否定句。例如:
There is something wrong with his bike. There is nothing wrong with his bike.
I have seen the film. I have never seen the film.
二. 祈使句的构成形式及基本用法
祈使句是用来表示命令、请求、建议、号召等的句子,谓语动词用原形,句末用感叹号!或句号.。朗读时一般用降调。
1. 肯定的祈使句:
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