1. bring sb sth 给某人拿某物
相当于bring sth to sb，类似的动词还有give,show,offer。
例句：
Can you bring me the cup? Ijust can't reach it.
你能把那个杯子给我拿来吗？我够不着啊。


2. (just) the check 请买单
例句：
I don't want anything more. Just the check,please.
我不想再点什么了。买单吧。


3. let sb get this. 让某人买单吧。
例句：
I'll treat you all. 
我来请大家伙吧。
Ok, we'll let you get this since you have earned your income.
好的，既然你已经赚钱了，那我们就让你请客了。


4. It's sb's treat. 这顿某人请。
例句：
You do nothing of the sort. It's my treat today.
你别这样，今天我请客。


5. It's on me. 算我的账上，我来请。
与例4的意思相同。
例句：
It is on me to treat you. Please accept it.
让我请吧，没事儿的。