一般将来时 be going to do/ will do 如,I'm going to visit my teacher
肯定句 一般陈述句 I'm a student
否定句 be not I'm not a student
一般疑问句 一般疑问句中疑问词提前 Are you a student?
特殊疑问句 特殊疑问词+一般疑问句 what are you doing?
选择疑问句do/be … or … Is tomorrow Saturday or Sunday?
现在进行时be doing I'm watching TV now