一般现在时:doesn't go
如:He doesn't go to school by bus every day.
一般过去时:didn't go
如:He didn't go to see the doctor yesterday.
含有实意动词的否定句:
在动词前面加don’t，doesn’t，didn’t
后面的动词要用原形。
① 如果主语是第三人称单数的时候，用doesn’t+动词原形
He speaks English well.→He doesn’t speak English well.
② 如果主语不是第三人称单数的时候，用don’t+动词原形
You run fast.→You don’t run fast.
过去式只有一种： didn't+动词原形
I bought a book.我买过了一本书。
否定句：I didn't buy a book.我没有买一本书。
再看例子：
We looked after the dog.→We didn’t look after the dog.(look after 照顾)
He speaks English well. 他英语说的很好。
否定形式：He doesn’t speak English well.
You run fast.你跑的很快。
否定形式：You don’t run fast.
Tony likes the book.托尼喜欢这本书。
否定形式：Tony doesn’t like the book.
We sing songs together.我们一起唱歌。
否定形式：We don’t sing songs together.
We have some pens.我们有一些钢笔。
否定形式：We don’t have any pens.
She has an eraser.她有一个橡皮擦。
否定形式：She doesn’t have an eraser.
