It would be so exciting if I could do that.

如果我能做到，那将是非常令人兴奋的。

Shall I be believed when I say that, at the depth of thirty feet, I could see as if I was in broad daylight?

当我说在三十英尺深处，我能看得像在白天一样清楚时，你会相信吗？

I asked my deskmate if I could borrow a pen.

我问我的同桌是否可以借我一支笔。

If I had Doraemon's Anywhere Door, I could go anywhere.

如果我有机器猫的任意门，我就能去任何地方。

He asked if I could help him move, and I said okey.

他问我能不能帮他搬家，我说好的。

So I told myself I would also make a difference if I could hold on for a longer time.

所以我告诉自己，如果我能坚持更长时间，我也会有所作为。

If I could locate the nest, I might have been able to put it back, but no luck.

如果我能找到鸟巢，我也许能把它放回去，但运气不好，没有找到。

It would my greatest happiness if I could work at the operating table until my dying day.

如果我能在手术台上工作到死，那将是我最大的幸福。

I am emailing you to ask you if I could borrow your bike.

我给你发邮件是想问你我是否可以借你的自行车。

After I unpacked, I asked if I could have a guide to show me around the town.

打开行李后，我问能否有一个导游带我参观这个城镇。