How can the key of F become F?

There is no way. In music, there are only 12 keys. 2 have an 'f' in it. They are F and F#. (Fb is actually the same a 'E'). There is no such thing as F-, is there! (Except for the one that your...

Simple. When you say 'F', I hope you mean the one that you get from a teacher for bad work. If you want an F to become F-, do one of the following: 1) Go to another school with stricter teachers OR2)...

First space.:-)

D major has both c and f sharp only, but the key A major has F,C and G sharp. In this case I guss you mean D major

If you look at the black keys they are grouped in 2's and 3's. Now look at the group of 3. F-sharp is the black key in the group of 3 that is farthest left.