英语肯定句∶
A duck can swim.
一只鸭子会游泳。
英语肯定句∶
A duck can't swim.
一只鸭子不会游泳。
将肯定句改为否定句的方法∶
在系动词be、助动词be,
have/has/had,will,shall,would,should和情态动词后加not(n't)。若句中没有这些词,则根据谓语动词的原形、第三人称动词形式或过去式而分别在其前面加do not(don't),does not(doesn't)或did not(didn't),并将第三人称动词或过去式改为原型。如:
(He)用含否定意义的词(如:never,nothing,nobody,none,neither,little,few等。
①always/evernever,andor。如:
肯定句∶He was always late for school last term.
否定句∶He was never late for school last term.
肯定句∶They have ever read the book.
否定句∶They have never read the book.
肯定句∶He can speak Chinese and English.
否定句∶He can't speak Chinese or English.
②too not…either,already not…yet。如:
肯定句∶He goes to school by bike,too.
否定句∶He doesn't go to school by bike, either.
肯定句∶He has already finished the work.
否定句∶He hasn't finished the work yet.
③allnone,bothneither,both…andneither…nor,此时,谓语动词仍用肯定形式,但当neither作主语,谓语动词用单数形式;neither…nor…连接两个主语时,谓语动词应和nor后面的主语保持一致。如:
肯定句∶He knows all of the workers here.
否定句∶He knows none of the workers here.
肯定句∶Both of the twins are from England.
否定句∶Neither of the twins is from England.
肯定句∶Both Emma and John have gone to Tokyo.
否定句:Neither Emma nor John has gone to Tokyo.
3.当think,believe,suppose等动词后面跟宾语从句时,通常用否定主句谓语动词来达到否定从句谓语动词的目的。如:
肯定句∶I think they can come tonight.
否定句∶I don't think they can come tonight.
4.当must表示推测,表示“一定、肯定”的含义时,否定句应用can't。例:
肯定句∶He must be in the room.否定句∶He can't be in the room.
肯定句∶He book in two months.
否定句∶He won't write the book in two months.
存疑请追问,满意请采纳,谢谢
(。ò ∀ ó。)