求几句简单英语口语翻译...(最好地道点)

I came by few days(sometime) ago.sometime这个更加简单，不过不太具体了。
Up to you.或者是Be my guest.（这个lost里面很常用）
Don't challenge my temper.（不要挑战我脾气，这个老外很喜欢用）
It goes without saying.He's the guy.(He did it.)第一句那个是非常好用的口语表达。
You mean and stingy creature(guy).这个是美剧都非常流行的说法，非常地道，这里不用谓语的。

1. I've been here couple days before.
2. Whatever./As you wish.
3. I have my deadline.
4. No doubt, it must be him.
5. You are so mean.

I've been here several days ago.
Your choice!/Up to you!
I've come to the end of my patience.
Come on,he must have done it!
You cheap stake!

I came here a few days ago.
Do as you wish.
My endurance is limited.
It is out of question that he did it.
You are such a miser!

i have been here several days ago
help yourself
my pacience is limited
do not think of it any more. it must be him
you,miser!