1、定義：表示將要發生的動作或存在的狀態，以及打算、計劃或準備某事。句中一般含有表示將來的時間狀語，如：tomorrow morning，next week，this afternoon等表示將來的時間狀語。

2、構成：

① be gong to +動詞原形

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 +動詞原形

如：They will go swimming this afternoon.

3、be going to 和will 區別：

① be going to表示經過事先安排、打算或決定要做的事情，基本上一定會發生;will則表示有可能去做，但不一定發生，也常表示說話人的臨時決定。

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生的事情;will表示的將來時間則較遠一些。如：He is going to write a letter tomorrow. I will meet her one day.

③ be going to還可以用來表示有跡象表明某件事將要發生，常用于天氣等自然現象。如：Look! It’s going to rain.

4、一般將來時句型轉換：

肯定句 否定句 一般疑問句及回答

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.