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一般現在時講解:否定句的結構

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2018年03月07日

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  一般现在时的结构是由动词原形构成的。根据人称的变化,谓语动词有单、复数的变化。它可以表示经常的、现在的、过去的、将来的动作。今天小编给大家推荐的一般現在時講解:否定句的結構一文。希望对大家有所帮助。

  一般現在時的否定句

  一、一般現在時變否定句的規則.

  一)、主語+be動詞

  含有 am is are 的句子,变否定句时,只需在am is are 后加not.

  【例】This is a book. 否定句 This is not a book .

   I am a teacher . 否定句I am not a teacher .

  These are pens . 否定句These are not pens .

  二)、主語+實義動詞

  含有實義動詞的句子,變否定句分兩種。

  1、如果主語是第三人稱單數時,要在實義動詞前加doesn't,後面的動詞用原形。

  【例】He eats an apple. 否定句 He doesn't eat an apple.

  Jim does his homework. 否定句 Jim doesn't do his homework.

   Marry goes to school. 否定句Marry doesn't go to school.

  2、 如果主语不是第三人称单数时,只需在实义动词前加don't.

  【例】I teach English. 否定句 I don't teach English.

  三)、主語+情態動詞

  含有情态动词的句子,变否定句时, 只需在情态动词后加not.

  【例】 I can dance. 否定句 I can not dance. 或 I can't dance.

  They can speak English. 否定句 They can not speak English. 或They can't speak English.

  【注意】He must be on the playground. He can not be on the playground. 析:当must be用来表示推测,有“一定”的含义时, 否定式要用can not.

  You must say something at the mecting.否定句 You needn’t say anything at the mecting.

  析:当“must+行为动词”用来表示“必须”的含义时,其否定式可用needn’t 或mustn't表示“不需要”,“不必”, 语气委婉,must not表示“禁止”,“千万别”语气生硬。

  You may come in now. You mustn't come in now.

  析:may作为情态动词表示“可以”时, 其否定式用must not,而不用may not.

  四)、注意

  1、含有have和has的句子變成否定句

  have和has,變否定句不能在have和has後加not,則需要助動詞來幫助解決。

  have→do not have或don’t have

  has→does

  not have或doesn’t have (has要变成have)

  【例】I have a pen. 否定句I don’t have a pen。

  My father has a watch. 否定句 My father doesn't have a watch.

  2、见到some 变否定句时,要换成any.

  【例】I eat some apples. 否定句 I don't eat any apples.

  He has some books. 否定句 He doesn't have any books.

   He does his home work. 否定句 He doesn't do his home work.

  3、见到and 变否定句时,要换成or.

  【例】There is some air and water on the moon.

  否定句 There isn't any air or water on the moon.

  He has some brothers and sisters.

  否定句 He hasn't any brothers or sisters.

   He eats apples and oranges.

  否定句He doesn’t eat apples or oranges.

  4、見到too和also變否定句時,要換成either.

  too和also用于肯定句中時,否定句中用either替換。

  【例】Tom goes to school too.

  否定句 Tom doesn’t go to school either.

  5、a lot of (=lots of)变为many或much。

  【例】They have a lot of friends.(可数名词)

  否定句They don't have many friends.

  There is lots of orange in the bottle.(不可数名词)

  否定句There isn't much orange in the bottle.

  6、見到already變否定句時,要換成yet。

  【例】He has had supper already.

  否定句 He hasn’t had supper yet.

以上就是小編爲大家整理的一般現在時的否定句結構,掌握基本結構之後做題就很順利了,希望各位同學學完此結構之後多加練習,鞏固自己的學習。


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