表示主语有做某事的倾向,或迫切做某事等概念。例如:
The potatoes are ready to be dug up. 快要收获土豆了。
He is apt to get excited over trifles. 他容易为小事而激动。
These little children are eager to learn how to play the piano. 这些小孩子急于学弹钢琴。
三、“能愿类”的形容词,如:able, unable, willing, unwilling等,表示主语能否、愿否做某事。例如:
I am not really willing to spend an evening there. 我其实不愿在那儿消磨一夜晚。
Are you able to sit through the play? 你能耐着性子看完戏吗?
这类结构,形容词与不定式构成“合成谓语”,不要拆开细分。