be going to do和be doing和want to do 三者之间的区别

问题描述:

be going to do和be doing和want to do 三者之间的区别

be going to do表个人计划,打算;还表迹象,征兆.be doing也可表个人计划,打算;同时还是进行的构成.want to do 只表想要做某事.