Is it correct to say Could you give me?

It is correct to say could you give me.

This can be explained as follows: could is the past form of can but some time it is also used in the present form whenever we want to say to anyone with humble respect then we use could instead of can.

For example when we talk to our sir aur teacher ,then we say that could you explain again sir ? here, could is used for humble respect and another example of this ,when we talk to our friend .then ,we just said to her that could you give me water? here could shows that it is a fast form of can.