“我先走了”的英语并不是说 I go first，“我先离开，非走不可”的英语句要如何表达呢？

I've got to go.

我得马上走了。
I'd better be going.
我想我该走了。
I must be off now.
我该走了。
I must get going now. I've got an appointment at 5 o'clock.
我得走了，我五点钟有约会。
Got to be going, I'm afraid, or I'll be late at the office.
我该走了，不然上班会迟到。

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