Should we tip?
我们是不是应该给点小费?
We left a tip for the waiter.
我们留给服务生小费。
You don't need to tip here.
(在这儿)不需要给小费。
A service charge is included in the bill.
服务费已经包含在帐单里了。
The service was excellent.
服务挺好的。