感官动词的被动感官动词一定是被动或主动吗?或者什么情况下用主用被?被动一定是to do形式吗?-------------

答
感官动词feel,听hear,listen to 看see,notice,watch等词后面有三种用法的,后面用什么动词就看跟这些动词后面的宾语和动作的关系,如see sb do sth 和see sb doing sth后者强调看见某人正在做某事,也有see sb/sth done看到···被···使役动词Let,make,have后面也有三种,如have sb doing 让某人一直做某事,have sth done让···被做,have sb do 让某人做什么事···
原本这些词后面是要上(to)do的,但是省略了变成不带to的不定式,所以被动的时候就要把to还原了如he was seen to have a supper with his family.把主语提前了,所以要用被动,其他词也可以这样用
省略 to 的不定式做宾补的动词有：
1、一感 feel 形式：feel sb do sth feel sb doing sth
2、二听 hear ,listen to 形式：hear sb do sth hear sb doing ;
listen to sb do sth listen to sb doing sth
3、三让 let,have,make 形式：let sb do sth make sb do sth
4、五看 see,notice,watch ,abserve ,look 形式：see sb do sth see sb doing sth
这些省略to 的不定式做宾补,在变为被动语态时要还原to
例如：I saw Tom fall off the tree .(变为被动语态)
---Tom was seen to fall off the tree by me.