关于be to do 和 will be doing

关于be to do 和 will be doing be to do与will be doing will be 和will be doing 和be going to do 三者区别. 关于be seen doing 和 be seen to do be doing/to do,will be doing区别 be doing 和will do 和be going to do 的区别 be going to do 和will do和 be doing都能表将来吗? 区别be going to do/will do/will be doing/be to do will,be going to do,be doing表将来 be going to,be doing,will do有什么区别 will \be doing to do \be about to do \be to do的区别 will be doing,be going to do,will do ,有什么差别?be going to leav