will和be going to be和 want to be有什么用法区别?

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 youwant to be意思是“想成为……”,表示主观上想 / 打算做什么,与Be going to to be相似.如：我想长大后当老师.I want to be / am going to be a teacher when I grow up.毕业后你想当什么?What do you want to be /are you going to be after you graduate?

will & be going to do sth. 都表示的是将来
而want to be 是表示想要做某事， 和上面两个没有可比性

will和be going to 有可比性
will表示单纯将来，不带任何主观成分
They will arrive here tomorrow.就是说将来会到达.这就是单纯将来
be going to 作“打算”解，是根据事先安排，主观的
will,还作“愿意”解，
有个情况要用be going to
It is going to rain.翻成“...