urgent!!

Could I borrow your car? = 我可以借你架車嗎？
而當中"Could"既意思是不算太有禮貌的說話方式。


May I borrow your ca? = 我可以借你架車嗎？
而當中"May"既意思包含許可或請求許可。


You can have one more if you want. = 如果你想，你可以要多一個。
而當中"can"既意思是不算太有禮貌的說話方式。


You may have one more if you want.
而當中"may"既意思是可能、也許的意思。


總括而言，
通常用"can"是不算太有禮貌既意思，
而用"may"俾人既感覺係禮貌d同誠懇d。

Could I borrow your car?
May I borrow your car?

use "may" is more polite than use of "could". The owner of the car is willing to lend the car to a polite "girl/boy/man/woman"

I means that hte success rate of 2nd sentence is higher than 1st ones.

You can have one more if you want.
You may have one more if you want.

the meaning of these 2 sentences is same use = you are allowed to choose one. The meaning of "may" is can, be able, or be allowed

Both were the same question
The first ones state that you ask yourself not the other
The second ones clearly state do the other want to let you do that

Could I borrow your car?
May I borrow your car?

用 may 比較有禮貌,
同埋, 用 may 人地聽落, 好似可以 say no 囖.
而用 could 嘅情況,
如 could you give me a favor. 都係好常見嘅用法.
就好小聽人 may you give me a favor. 咁講太姿整勒.

You can have one more if you want.
You may have one more if you want.

用 can 聽落人地真係比多件你, 人地預左.
may 就只係禮貌問你要多件, 當然你要多件人地唔會介意.

基本MAY同CAN/COULD意思相同，都係解作"可以"，用在問題上就可解作"可不可以"。
CAN和COULD有現在式和過去式的分別，有時在問題上，用COULD的語氣比CAN較有禮貌。
而MAY則是語氣最嚴肅，例如對例師長說。
所以 兩組句子意思分別相同，只是語氣不同。
記著 CAN

Could I borrow your car?
May I borrow your car?
這兩句分別不大, 都是有禮貌地問對方可否借車給我.


You can have one more if you want.
You may have one more if you want.
這兩句就有分別
You can have one more if you want. 是
"如果你有需要, 你可以取多一個"
這一句, 語氣是肯定的
You may have one more if you want.
"如果你有需要, 你或者可以取多一個"
這一句的語氣是不肯定的

4句句意上其實無分別的
但運用may比can/could是更有禮貌

因此問人借東西/以客氣的話請別人用某東西的時候用may是較合符禮節的