be going to+动词原形与will+动词原形两者都可以表示将要发生的事、或将要去做某事，但它们有哪些区别呢？详细be going to与will的用法区别如下：

be going to与will的用法区别

1. be going to结构表示主观上将要发生的事情或打算最近要进行的动作;will表示客观上将来势必发生的事情(单纯的将来)。be going to结构总是表示经过预先思考的意图或计划，而will+动词原形只表示意图，这意图通常是未经过预先思考的。例如：

I have bought some bricks and I’m going to build a house.

There is somebody at the hall door，I’ll go and open it.

He is seriously ill. He is going to die.

It is going to rain soon.

He will be thirty years old next month.

如果没有明显迹象表明意图是否经过思考，则 be going to或will都可以使用。例如：

I will/am going to climb that mountain one day.

I won’t/am not going to tell you my age.

2. be going to 表示近期、眼下就要发生的事情，will 表示的将来时间则较远一些，如：

He is going to write a letter tonight.

He will write a book one day.

3. be going to 含有“计划，准备”的意思，而 will 则没有这个意思，如：

She is going to lend us her book.

He will be here in half an hour.

4. 在有条件从句的主句中，一般不用 be going to, 而多用will, 如：

If it is sunny tomorrow, I'll go swimming with you.

The football match will be put off if it rains tomorrow.

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