Should we tip?
我們是不是應該給點小費?
We left a tip for the waiter.
我們留給服務生小費。
You don't need to tip here.
(在這兒)不需要給小費。
A service charge is included in the bill.
服務費已經包含在帳單里了。
The service was excellent.
服務挺好的。