句型转换（每空一词）。 1. David is going to have some Chinese classes tomorrow.（改为否定句） David ____ going to have Chinese classes tomorrow. 2. The students of Class Two have a field trip on Sunday.（用next Sunday改写） The students of Class Two a field trip next Sunday. 3. They are going to go fishing tomorrow morning.（改为一般疑问句，并作肯定回答） － going to go fishing tomorrow morning? －Yes, they____． 4．We are going to the city by train .（对画线部分提问） going to the city? 5. She is going to leave at nine tomorrow. （对画线部分提问） she going to leave?