一般说来,在“感官动词”（如 see,hear,watch,feel,notice,look at,listen to 等）以及某些“使役动词”（如 make等）之后的复合宾语中,不定式是不能带to 的,但若是变为相应的被动语态,则应加上这个to：
1．John was made____the truck for a week as a punishment．
A．to wash B．washing
C．wash D．to be washed
2．Paul doesn't have to be made____．He always work shard．
A．learn B．to learn
C．learned D．learning
3．He not only made the workers____long hours but he was also
seen____them．
A．work,beat B．to work,to beat
C．work,to beat D．to work,beat
4．a He often listened to others____．
b．He was often listened to____in this room．
A．sing,to sing B．to sing,sing
C．sing,sing D．to sing,to sing
答案：1．A 2．B 3．C 4．A