1. You're ambitious!
= Are you sure?
It sounds almost impossible
I don't think you can do it.

2. No, go on. I'm listening.
= I need you to finish talking, so I can carry on with my job!

3. I don't know / We'll see / I'll think about it!
= (most probably) no!

New Words / Idioms:
Remorseful = sorry. I wish I hadn't done that.

You've taken me back (+ to)
= You have reminded me of a time in the past

You've made my day
= You've made me very happy!

I can't stress enough =
It is very important...

No word of a lie
= Believe me! I swear.