You would use it when asking another person to check on something. It doesn't have to be anything...

Too complicated and long-winded is one thing, but it also doesn't sound right - I think it may be...

Could you please help me confirm the following information?（能請您協助我確認以下資訊嗎？） Could you kindly help...

中文使用者在學英文時的一大障礙就是常會從中文去逐字翻譯所以當要表達「你可以幫我買午餐嗎？」這樣的句子時很容易就直接講成Could you help me to ... ...

Could you please help to check it? or Could you please help to look at it?? - Which English form ...

口氣是一般的、正常的，而在說 Could you help me with this? 就聽得出來是表示禮貌的語氣了，所以Can you ...? 可以跟同事、很熟的朋友說；Could you ...