有關Can/Could/Would用於Question

When we request somebody to do things, we normally use could/would, which are more polite. Basically, they can be used at any situation.

Would/Could you please do me a favour - pass me the book next to you?
Would you join us on Sunday ?
Could you join us on Sunday?

Could we go out for a walk? - ask for permission
Would we go out for a walk? - ask for decision

每次講到e d modal verb, 要搞清楚就係能力同意願既分別
就好似中文咁，「可唔可以」其實有兩種意思，
一個係能力上做唔做到，一個係意願上肯唔肯做

用例子黎講啦
一般見到有人需要幫助都會問can i help you而唔係could i help you既
原因就在於e個情況用can i help you 個can 意思就係能力上既能唔能夠
即係「請問我幫唔幫到你啊?」
而could i help you其實一樣成立，不過意思就變左「可唔可以比我幫你啊?」
如果一定要用中文黎概括既話
request就係要求/請求
而offer就係提供/給予
既然你知道request係ask people to do sth.
offer其實就係you do sth for the others, 做之前，問一問先

至於接i同you有咩分別? 分別咪就係在於要做個動作既人唔同囉
不過老實講一般e三個都比較少跟i, 因為如果係自己想做既野去問人會用may i
至於對人用就比較少用can you, 因為could同would會有禮貌d

後面既主詞有無要求? 係上面果題都已經大致答埋你lu

最後都係講句，其實grammar唔係死既，所以唔洗死板地記rules, 諗番個意思就會通晒