如果有be动词,那么be后面直接加not, 如:She is a student.----She is not a student
如果有情态动词,那么情态动词后面直接加not, 如:She can read English.---She can not read English
如果有助动词,那么助动词后面直接加not, 如: I have been to Beijing.---I have not been to Beijing
如果啥都没有,那就给它一个助动词,如:She reads English in the morning.---She doesn't read English in the morning.注意到两句话的区别了吗,reads变成了doesn't read,does就是助动词,后面加not,reads去掉s,恢复原形,如果主语不是三单形式,行为动词也不用三单形式,如:I read English in the morning.--- I don't read English in the morning,助动词也不用三单形式