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.