作定语的动词不定式,表示的行为通常是未来的行为,总是放在它所修饰的名词或者代词之后．
Ihave many books to read.
做宾语补足语的动词不定式,是用来补充说明宾语的.
I ask him to show the film again.
因此,做ASK宾语的不只是HIM,而是HIM TO SHOW THE FILM AGAIN．
作宾语补足语时,有两种形式：一种是带TO的,一种是不带TO的（make,let,have,see,hear,notice,watch,feel know,obseve,find,listen to,look at）．
He likes his wife to dress well.
let us toast the bride and bridegroom.
We chose Xiao Wang(to be)our group leader.
think,consider,believe,find,feel,know,这类次后面可以用宾语补足语,但是这种作宾语补语的动词不定式短语都由TO BE＋形容词构成,而且TO BE可以省略．