Grammar

"Where do I pay?" is more definite. "Where could I pay?" is talking more about a possibility or hypothetical situation. If you wish to pay but you do not know where to go, use "Where do I pay?".

However, if broaching the subject to a stranger, it would sound blunt to just come out with "Where do I pay?", and people would normally add some politeness, such as "

"If broaching the subject to a stranger, it would sound blunt to just come out with "Where do I pay?"

Sorry , I'm a little confused. ( Because it is rude so , sound blunt? And definite sentence ? ) Do uses in definite sentence?

Thank you.

pine Because it is rude so , sound blunt?

Yes, it could sound rude, or at least abrupt, if you just walk up to someone and say "Where do I pay?". People usually add some extra words to such questions to make them more polite -- at least an "Excuse me, ...". However, if you have already been having a conversation with someone, for example about a purchase, t

I'm just wondering about "do ". I know until now "do " is used when you want to make interrogative sentence in present and "do "used all the time.

"do" can be used in affirmative sentences for emphasis:

Mmm ... I do like these chocolates!

and often to contradict or disagree with something that someone else has said:

A: You don't make any effort.
B: I do make an effort!

pineI'm just wondering about "do ".

It is important to put the words you are mentioning, or

Thank you so much ! Have a good day

One more please. Is it possible that "Where do I pay?" is similar to "where do I usually pay?"

Normally you know where you usually pay, because you have done it regularly in the past. "Where do I usually pay?" sounds as if you have forgotten.