1、定義：表示將要發(fā)生的動(dòng)作或存在的狀態(tài)，以及打算、計(jì)劃或準(zhǔn)備某事。句中一般含有表示將來(lái)的時(shí)間狀語(yǔ)，如：tomorrow morning，next week，this afternoon等表示將來(lái)的時(shí)間狀語(yǔ)。
2、構(gòu)成：
① be gong to +動(dòng)詞原形
如：I am going to see a Beijing opera tomorrow.
We are going to meet at bus stop at half past ten.
Dad and I are going to see a Beijing opera this afternoon.
② will +動(dòng)詞原形
如：They will go swimming this afternoon.
3、be going to 和will 區(qū)別：
① be going to表示經(jīng)過(guò)事先安排、打算或決定要做的事情，基本上一定會(huì)發(fā)生;will則表示有可能去做，但不一定發(fā)生，也常表示說(shuō)話人的臨時(shí)決定。
如：I am going to take part in a party this evening.
They are cleaning the library now. I’ll go and join them.
②be going to表示近期或眼下就要發(fā)生的事情;will表示的將來(lái)時(shí)間則較遠(yuǎn)一些。如：He is going to write a letter tomorrow. I will meet her one day.
③ be going to還可以用來(lái)表示有跡象表明某件事將要發(fā)生，常用于天氣等自然現(xiàn)象。如：Look! It’s going to rain.
4、一般將來(lái)時(shí)句型轉(zhuǎn)換：
肯定句 否定句 一般疑問(wèn)句及回答
She is going to have a picnic tomorrow. She isn’t going to have a picnic tomorrow. —Is she going to have a picnic tomorrow?—Yes, she is. / No, she isn’t.
They will go swimming this afternoon. They will not(won’t) go swimming this afternoon. —Will they go swimming this afternoon?—Yes, they will. / No, they won’t.