011 Empty bags can't stand.空袋子立不直。

语法点 情态动词can表示能力

类例

One cannot always be a hero, but one can always be a man．人难一世称雄，但可一生为人。

You can pretend to be serious; but you can't pretend to be witty．你可以假装严肃，但你无法假装风趣。

填空练习

1．经验是你无法白得的一个东西。

Experience is one thing you can't get for _____.

2．银行是一个如果你能证明你不需要钱才愿意借钱给你的地方。

A bank is a place that will _____you money if you can prove you don't need it.

（答案：1. nothing 2. lend）