现在进行时的will和be going to要怎么使用?

现在进行时的will和be going to要怎么使用?
好像很乱!我举个例子1)There is going to be a concert in our school this Saturday afternoon.可否改成There will be a concert in our school this Saturday afternoon. 2)My brother is going to work in Australia next month.可否改成My brother will work in Australia next month.如果不行,是为什么呢?请各位告知两种的用法,和不能互换的情况吧,谢谢

e going to与will的区别
be going to与will两者都可表示将要发生的事、将要去做某事,但它们有如下几点区别：
1.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.
2.be going to 表示根据主观判断将来肯定发生的事情,will表示客观上将来势必发生的事情.
He is seriously ill.He is going to die.
He will be twenty years old.
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 any beasts comes at you,I'll stay with you and help you

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