句型分析： 1、一般疑问句是将be动词移到主语前面，句末加问号，读升调。 be+主语+doing sth Are they putting up the scaffolding? Yes, they are. / No, they aren't. Is he showing a foreign guest round the city? Yes, he is. / No, he isn't. 2、否定句式是在be动词后加not。 主语+be+not+doing sth I am not working. He isn't running on the track. The students aren't playing football. 上一篇：perfect的名词是什么 下一篇：盐城有哪些大学 |