1.worried(因为feel指人的感觉,应用ed结尾的形容词,例如:interest,interest,interesting)2.I saw him playing in the garden this afternoon.Mare saw her brother enter the building. 用doing 的时候,表示我看到了某个动嘴的瞬间,强调的事doing;而do则标志我看到了某个事情的全过程,强调是see
feel为半系动词，后接形容词作表语——答案应为worriedsee sb doing看见某人正在做某事，“看”的时候动作“正在发生”着如： I heard him playing the piano when I walked past his room.see/hear/notice/watch等为感官动词，后接两种结构 see sb d
worriedfeel为系动词，felt 是其过去式。。后接形容词作表语——答案应为worriedI saw them playing basketball at 5 p.m. yesterday.(打篮球的动作正在进行,表示部分进行着的动作.)I saw them play basketball yesterday. (打篮球的动作已完
