Is one allowed to offer gratuities to the guides?

可以给导游吗?

The waiters liked him for being a big tipper.

他给手慷慨，侍者都喜欢他。

There is no service charge and tipping is at your discretion.

收服务，给给您看着办。

Did you tip the waiter?

你给侍者没有?

After a week, at a hotel, of tipping doormen, bell boys, waiters, hatcheck girls, ad infinitum, a traveler was completely fed up with the whole system.

在旅馆经过周的给给开门员、杂役员、服务生、衣帽间女侍等无穷无尽的人等之后，某旅客全然消受整套制度。