英语怎么改否定句?举个例子!

陈述句变否定句的方法：
句中有动词be( am ,is ,are ,was ,were),情态动词（can / could ,may ,must ,will ,would 等）,助动词（如完成时态中的HAS / HAD ）,变否定句时直接在这些词后加NOT ；否则要加助动词Do ,Does （主语第三人称单数）,Did （一般过去时）,原来的动词要还原；另外,句中有SOME 是一般改为ANY ,如果有AND 要改为OR,（因为否定句中的并列要用OR）already 改为yet（且放在句末）；祈使句的否定句是直接在句首加Don’t ;
( 如Open the doo r,please .-> Don’t open the door ,please .) 不定式的否定句是在不定式前加NOT ,如 She asks the boy not to play in the street .
He is a student .-> He isn't a student.
There are some flowers in the room .-> There aren't any flowers in the room .
加油!不明白再问!1 Open the doo r,please .->Don’t open the door ,please . 2 Sheasks the boy not to play in the street . 3 He is a student .->He isn't a student.4 There are some flowers in the room .->There aren't any flowers in the room .5 He has finished his homework .->He hasn't finished his homework.6 He can swim .->He can't swim .7 He went to the park last Sunday. ->He didn't go to the park last Sunday.8 I like English .->I don't like English.9 She likes singing .->She doesn't like singing .10 They will finish the work tomorrow.->They won't(= will not )finish the work tomorrow.