句型分析

1.一般疑问句 是将be移到主语前面，句末加问号，读升调。 　　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. 　　I am not working. 　　He isn't runnig or the track. 　　The students aren't playing football.