How/What about 后是否加doing

How/What about 后是否加doing what about 后加to还是doing What about/ how about doing sth How about doing sth?What about doing sth? how about doing后面加什么词 how about后接doing sth? what about 是加 doing吗 what about加doing还是to do What about+doing?后面加名词ing? how about=what about后加名字,代词,动词ing,那为什么会出现how about by train? what about和how about后都加doing吗? what about后加什么?