我得走了。再见。

I gotta go。=I have to go/leave。

I must be off/leaving。

I'm afraid I must say goodbye .

I'd better hit the road。

Hit: n暂时受欢迎，取得了以下巨大成功

The song became a hit。

努力学习Hit the books

Hit the bottles酒精中毒

Hit the shower洗澡

I should be on my way .

I've come to say goodbye。

I'm gonna miss you。

你一定要去吗？欢迎回来

Must you go？

Can't you stay？

Look forwad to seeing you again。

希望万事如意

All the best/Best wishes。

Take care。

Enjoy yourself。

Have fun/a good time。

Thanks all the same=thanks anyway。

请像你父母一样问候我。

please send/give my best wishes(regards)to your parents。

保持联系

Keep/Stay in touch。

Don't be a stranger .

非常感谢您的送行

Thank you for coming to see me off。

please drop a line after you get there。

到达的时候给我消息。

I sure will. /You can count on that.

我肯定会的。

一些用法：

count chickens 为时过早，得意太早

count the days 望穿秋水

count the pennies 斤斤计较

旅途愉快

Have a nice/good trip/journey.

Have a safe landing. 坐飞机的时候

谢谢你的款待

Thank you for your kind hospitality.

Thank you for everything you did.

太客气了

You're welcome.

Don't mention it.

It's not a big deal.

拜访

drop in on sb/at a place 顺便拜访某人

pay a visit to sb 比较正式

look sb up 通常指拜访很久没见面的人