will,be going to do,be doing表将来will 与 be going to do和be doing都表将来 区别是什么?如题：i ___ 14 years old next year.这里填be going to be 但为什么不用will?

be to do,be going to do,will do,be about to do的区别. be going to,be doing,will do有什么区别 will be 与be going to do 的用法 be to do.be going to do.be doing.will do.有什么区别? be going to do/be doing/will do/be to do等 的区别~ will to be going to be about to do be to 有什么区别? 请问be to do.be about to do.be going to do.will do用法的区别. 高一英语 一般将来时be going to/will do/be about to do/be to do的区别 英语中表示将来时的用法意义有什么不同?be going to do/be about to do/will do/will going to do be going to do 和will do和 be doing都能表将来吗? 一个很简单的英语问题!急!be going to do ,be going to be ,will do,will be有什么区别?详细一点,谢谢各位了 will be doing,be going to do,will do ,有什么差别?be going to leave是错的吗?还有be leaving如题 be going to will have be going to do,will be,be doing三种用来表示未来时有什么差别? will 和 be going to do sth.的区别请学长们指教:will 和 be going to do sth.还有 will 和 shall 的区别. be to do ; will be ; be going to ; be about to ; 现在进行时表将来有什么区别? will do与be going to do的区别?There_____a ball game tomorrow.A.will be B.is going to be选哪个?说明为什么 be going to do sth