不定词句型：ADJ/ADV + enough to ……

　　结构︰主词+动词+…形容词/副词+enough+(for sb.)+to-不定词

　　说明︰此句型意为“足以…”。enough 可做<副词>或<形容词>用，在此做<副词>，可修饰<副词>或<形容词>，恒置于被修饰的<副词>或<形容词>之后。

　　We need several men strong enough to do the work.

　　我们需要几个强壮得足以做这件工作的人。

　　They bought a house large enough for ten persons to live in.

　　我们买了一栋房子，大得足以供十个人住。

　　He is competent enough to fill that position.

　　他足以胜任那职位。

　　He ran fast enough to catch the thief.

　　他跑得飞快，足以抓住那小偷。

　　Our teacher is old enough to retire.

　　我们老师年纪已够得上退休了。

　　The assignment is few enough to be finished within half an hour.

　　作业很少，足能在半小时内完成。