Could/can anyone tell me what the difference between 'can' and 'could' in the following sentences is? And, are they interchangeable in the following context? What Difference do the words 'can' and 'could' create when making a request or an offer?
Here are the examples:
Suppose, I am looking for a particular bank but I don't know where the bank is. I meet an old man and want to know the direction of the bank from him. So I ask him "Can/could you please tell me where the bank is?"
Could/can anyone please teach me how to share videos and photos on Facebook?
As usual, if there is anything ungrammatical in my writing, please correct it.
You can use either "can" or "could", Subhajit12. "Could" is more deferential.
Can or could (...) Instructions and requests: We use could you as a polite way of telling or asking someone to do something: Could you take a message please? Could I have my bill please? Can is less polite: Can you take a message please? (britishcouncil.org)