1。我在洗耳恭听。
2。忘记了，没记住。
3。钱是有数的，有花光的时候。

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1. I'm all ears.
2.It slipped my mind.
3.Money doesn't grow on trees.

呵呵，不简单哟

第二句还经常听到。其他两句是不是太书面语了？

前两句都很常见，不过最后一个没听人说过。

sigh. Know the first sentence, couldn't remember the second one. Didn't know the last one. should visit this forum more often.

第二句是在tofel里见过。其他两句到是比较少听说。

always feel weird if i speak those "li-yu" with Americans.

没听到老美说过。估计是你说出来别人知道，但是早就不流行了。

i can't