# 实意动词的否定 使用助动词进行否定 在助动词`do does did`后面加`not` ``` 一般现在时 do does(主语是单三人称) 一般过去时 did (过去时没有单复数的区分) do not = don't does not = doesn't did not = didn't ``` ``` I don't go to school by bus. She doesn't watch TV everyday. They didn't swim last night. ``` # 实意动词的提问 使用助动词进行提问 提问时，助动词位于句首，实意动词如果原本发生了时态上的变化，则需要变回原型 ``` He often plays golf. Does he often play golf? Yes,he does./No,he doesn't. They go to school by bus. Do they go to school by bus? Yes,they do./No,they don't. Sam had breakfast yesterday. Did sam have breakfast yesterday? Yes,he did./No,he didn't. ```