作定語的動詞不定式,表示的行為通常是未來的行為,總是放在它所修飾的名詞或者代詞之后．
Ihave many books to read.
做賓語補足語的動詞不定式,是用來補充說明賓語的.
I ask him to show the film again.
因此,做ASK賓語的不只是HIM,而是HIM TO SHOW THE FILM AGAIN．
作賓語補足語時,有兩種形式：一種是帶TO的,一種是不帶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,這類次后面可以用賓語補足語,但是這種作賓語補語的動詞不定式短語都由TO BE＋形容詞構(gòu)成,而且TO BE可以省略．