"Can" vs "could" vs "would"

Hi there, I have a question regarding the usage of cancouldwould. I know can Is less polite when it is used to request people to do things. I know would and could also be used in a more polite way. But can I interchange would and could when making requests to people.

Here are some examples:

1a- Helen, would you please be quiet? I am trying to concentrate?
1b- Helen, could you please be quiet? I am trying to concentrate?
1c- Helen, can you please be quiet? I am trying to concentrate? (I know this one is not so polite.)

2a- Hello sir, can you please tell me where the bank is?
2b- Hello sir, could you please tell me where the bank is?
2c- Hello sir, would you please tell me where the bank is?

3a- Could you please email me the directions to your house?

3b- Would you please email me the directions to your house?

So when making requests in a polite manner can I use would and could interchangeably in sentences like these ?

Last edited by subhajit123
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