用法透视：
这个句型用来说明某事很简单易行，"你所要做的一切只不过是??????"
支持范例：
1. All you have to do is to push the button and wait.
你所要做的就是按下这个按钮然后等待。
2.All you have to do is to sign here.
你只要在这里签字就行了。
3. They promised that all I have to do is to tell the truth and leave.
他们答应我只要我说出真相就可以走了。会话记忆：
A: Do you know how to play go? 你知道围棋怎么下吗?
B: It's easy. All you have to do is to use your pieces to surround the opponent's pieces and then take over all of his territory.
很简单。你所要做的只是用自己的子去围对方的子，然后 占下他所有的地盘就行了。
A: But I heard it is very difficult to play.
可我听说围棋很难下。
B: It's easier said than done. When you actually play, it can be very frustrating.
说当然比做容易。你真下起来的时候就很伤脑筋了。
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