我是用英文怎么表达？?

我是不是挑了个不恰当的时间跟你谈话？

Have I picked a bad time to talk to you?

通常情况下，我是不会看到这封信的。

Normally, the letter would not have come to my notice.

我是外国人这事实对我十分不利。

The fact that I was a foreigner was a big disadvantage.

我是爱莫能助啊。

It is not within my power to help you.

我是老主顾，他们都认识我。

They know me ─ I'm a regular customer.

他谈话中使用的行话对我是一团迷雾。

The jargon in his talk was opaque to me.