spend 10 years doing 中的doing 要用短动词还是长动词?还是都可以?
spend 10 years doing 中的doing 要用短动词还是长动词?还是都可以?
need doing是实义动词还是情态动词?
spend time in doing 可以与延续性动词连用吗?
sb.+ be doing里面的谓语动词是doing还是be,还是be doing?
是spend to do 还是spend doing
doing是动词还是名词还是什么词
spend time后面+on doing还是spend time doing
介词后动词是doing形式是指介词和动词之间没有任何其他词吗?还是无论有无其他词间隔,都为doing.
too to 句型后面跟doing 还是动词原形?
in order to 后加动词原形还是doing?
lead这个动词后面跟doing还是to do
动词 + sb 后面应该是 to do 还是 doing