希望你能尽快回复 用英语怎么说?

I am looking forward to your reply.
这句英语才地道。

直接可以说：
Looking forward to your reply at the soonest.
Await your soonest reply.

I am looking forward to your reply.
楼上的，你写错了

I hope that you could reply as soon as possible

I hope you can reply as soon as possible