1.动词不定式做宾补时 2.及物动词是以下动词： 一个感觉：feel 两个耳：hear,listen to 三个使役：make,have,let 五个视：see,look at,notice,watch,observe 这些动词的宾语后所带的动词不定式要省略to help后的动词可带to,也可不带to.这个不仅是宾补,宾语也可以的. 如： I saw him go out. I can't help (to) clean the room. 3.如果动词不定式不是宾补,则带to 如 He was seen to go out.
