Does后动词是原形还是加ing或s!急需!

Does后动词是原形还是加ing或s!急需! often后加ing还是加s还是动词原形? let's 是加动词ing 还是加动词原形? 是does'not后加动词原形还是does plan后加动词原形还是ing? let后面加动词ing形式还是原形let’s后是ing形那let后是什么? 动词SEE后加动词原形还是动词ING? except后加动词原形还是动词ing rather than之间 动词是原形还是动词加ing? I am的后面加动词原形还是ing急 feel 后加动词原形还是ing形式? why not 后加动词原形还是V.ING? and后的动词用原形还是加ing? understand后加to 动词原形还是动词过去式,还是直接加动词ing. should 后面是加动词原形还是ing形式 do well in后面是加动词原形还是ing thanks to 后面的动词是原形还是加ing he is后动词是加ing还是S为什么?