I think the name of the struture of this sentence is.

Question

Future perfect.

Could you open the window, please?

Is this correct?

Answer 1

No, that is not the future perfect. That would be will have +verb

Could when used in the present is in the subjunctive... It indicates the possibility that something "can " happen.

Answer 2

Here are some sites on subjunctive usage:

http://www.bartleby.com/64/C001/061.html

http://en.wikipedia.org/wiki/English_grammar#Subjunctive_mood

Answer 3

hey ummmmm you see i don't know what a metaphor is and when i checked on the internet i dident get it so please help me