我是用英文怎麼表達？?

我是不是挑了個不恰當的時間跟你談話？

Have I picked a bad time to talk to you?

通常情況下，我是不會看到這封信的。

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

我是外國人這事實對我十分不利。

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

我是愛莫能助啊。

It is not within my power to help you.

我是老主顧，他們都認識我。

They know me ─ I'm a regular customer.

他談話中使用的行話對我是一團迷霧。

The jargon in his talk was opaque to me.