1.主系表结构的句子
Iamateacher.-----Iamnotateacher.
HeisinBeijing.-----HeisnotinBeijing.
Weareclassmates.-----Wearenotclassmates.
Itwascoldyesterday.-----Itwasnotcoldyesterday.
这些句子中都有系词,am,is,are,was,were,只要在系词后面+not,就变成否定句了.
2.主谓宾的句子
Herunsfast.-----Hedoesn'trunfast.主语是三单人称,do也要用三单形式does
Theylearnfromme.------Theydon'tlearnfromme.
Wewenttoschoolbybike.-----Wedidn'tgotoschoolbybike.谓语动词是过去式,do也要变过去式did
这些句子中都有谓语动词,只要在主语后面+do的适当形式+not就行了.
3.句中有助动词或情态动词的
Iwillgetupearliertomorrow.-----Iwillnotgetupearliertomorrow.
Shecandancewell.-----Shecan'tdancewell.
Hehasgoneabroad.------Hehasnotgoneabroad.
只需要在助动词或情态动词后面直接+not,就可以变否定句了.
OK?希望能帮到你啊!