作表語:
Her job is to clean the hall.
He appears to have caught a cold.
作賓語:
常與不定式做賓語連用的動詞有:want, hope, wish, offer, fail, plan, learn, pretend, refuse, manage, help, agree, promise, prefer, 如果不定式後面有賓語補足語,則用it作形式賓語,真正的賓語後置,放在賓語補足語後面,例如:
Marx found it important to study the situation in Russia. 動詞不定式也可充當介詞賓語,如: I have no choice but to stay here.
He did nothing last Sunday but repair his bike.
動詞不定式前有時可與疑問詞連用,如: He gave us some advice on how to learn English.
作賓語補足語: 在複合賓語中,動詞不定式可充當賓語補足語,如下動詞常跟這種複合賓語:want, wish, ask, tell, order, beg, permit, help, advise, persuade, allow, prepare, cause, force, call on, wait for, invite.
此外,介詞有時也與這種複合賓語連用,如: With a lot of work to do, he didnt go to the cinema.
有些動詞如make, let, see, watch, hear, feel, have等與不帶有to的不定式連用,但改爲被動語態時,不定式要加to, 如: I saw him cross the road. /He was seen to cross the road.
