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

Will be doing是什么时态 will be doing 是什么句式, will be doing 与 would be doing 的区别 will be doing 是种什么用法? be doing be is going to will用法的区别 be going to,be doing,will do有什么区别 will,be going to,be doing用于一般将来时的区别 be going to be doing和will be doing表示的是什么意思? be+doing will be doing和will doing的区别就这个 是不是be可以省略啊? will be 和will区别will be doing sth和will do sth有区别吗 will do 和 will be doing有什么区别? 关于will 和will be的用法will be doing sth 有关将来时的英语题It ［ ］my brother's birthday tomorrow.He [ ]a party. A 选项是is going to be;will have B选项是 will be；is having C选项是will be;is goi 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~ be going to do,will be,be doing三种用来表示未来时有什么差别? will e doing to do e about to do e to do的区别