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(object complement)
( vt.)
(vt.)
They have a little food to eat.
To see is to believe.
He came to see me.
(attribute)
(adverbial)
(subject)
(vi.)
To dance is a lot of fun.
It is a lot of fun to dance.
(subject)
It is dangerous to play with fire.
To play with fire is dangerous.
To grow trees is very important.
It is very important to grow trees.
a. 不定式用作主语
To play with pets is interesting.
( It is interesting to play with pets. )
To do the job well is not easy.
( It is not easy to do the job well. )
It is (was) + adj. + of sb. to …
您能帮助我，真是太好了。
It is very kind of you to help me.
= You are very kind to help me.
你做那样的事是对的。
It is right of you to do that.
= You are right to do that.
对他来说，说声再见是最明智不过了。