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 .
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I like dog.
I don't like dog.
一般do开头的疑问句或肯定句要否定的话,在主语后面加don't就可以了
did开头的主语后加didn't
在be动词后面或助动词后面加not