see/ hear/ watch/ notice...sb do / doing sth
感官动词后的复合宾语（宾语+宾补）用不带TO的不定式作宾补,意思是：看 / 听到某人做了某事；后接现在分词作宾补,意思是：看 / 听到某人正在做某事
如果是被动语态,（主语的补语）不定式就要带TO
如：I saw him get on the bus.He was seen to get on the bus.
see/ hear/ watch/ notice...sb do / doing sth
感官动词后的复合宾语（宾语+宾补）用不带TO的不定式作宾补,意思是：看 / 听到某人做了某事；后接现在分词作宾补,意思是：看 / 听到某人正在做某事
如果是被动语态,（主语的补语）不定式就要带TO
如：I saw him get on the bus.He was seen to get on the bus.