肯定句变否定句一、 有be动词（am, is, are）的，可以在这些单词后面直接加not. 注意缩写 is not= isnt are not= arent二、 有情态动词（can, would）的，可以在这些单词后面直接加not. 注意缩写 can not=cant would not=wouldnt三、 没以上那些单词只有动词的，像walk, swim, run, clean, eat, drink, sleep 等等，需要在动词前加do, 然后再加not, 即 dont.例子：I am a nurse. I am not a nurse.1、 He is my father.He _ _ my father.2、 Id like a pie.I _ _ like a pie.3、 This is a book.This _ a book.4、 Tim and Tom have two robots.Tim and Tom _ have two robots.5、 Those are his robots.Those _ _ his robots.6、 Sam can swim.Sam _ _ swim.7、 Stand up._ stand up.8、 These are my crayons.These _my crayons.9、 There is a box on the desk.There _ _ a box on the desk.10、 I can see a boat.I _ see a boat.11、 Tim would like to sleep.Tim _ like to sleep.12、 I like apples.I _ _like apples.综合练习1、 I _(not) his sister.2、 _(not) clean the blackboard.3、 I _(not) have a book.4、 These _(not) my rubbers.5、 The door _(not) open.6、 _(not) have a look.7、 Id like an ice cream. (改否定句)8、 She can skate. (改否定句)