The Second Conditional

[joeoct]

If we use "could" instead of "can" to be more polite, are we obliged to use "would" instead of "will"?

One example:

I would/will appreciate if you could ...

Thanks

[emsr2d2]

If we use "could" instead of "can" to be more polite, are we obliged to use "would" instead of "can" "will"?

One example:

I would/will appreciate if you could ...

Thanks

We certainly start such sentences with "I would..."

I would be very grateful if you could send me the information.
I would appreciate it if you wouldn't do that.
I would like to know if he could fix my car on Friday.

[joeoct]

Thanks. Edited ("can" - typing mistake).

[Tdol]

I will appreciate it sounds like a veiled order and is quite strong.