Question on how the 7 modes of major work?

Question

Hi there, I've pretty big novice on music theory, as I'm just starting to get into guitar theory. My instructor has had me memorize the 7 modes of major on my guitar, such as dorian, mixolodian etc. When it comes to improvising my teacher says if I wanna play in the key of G I should choose any G on the fret board and play through whichever mode pattern that G happans to be under. However I seem to be reading that each different scale has different notes, Therefore how can I play both The C Major Scale and G Major Scale on the Same set of modes when G major scale contains an F# and C Major doesn't. (Whenever I play through my pre-practiced modes I have the following notes E-F-G-A-B-C-D-E) This would be the C Major Scale...So how is simply starting and ending on G going to allow me to play in the key of G? Is this simply a shortcut way of playing? Shound't I have a whole different position for each mode depending on the key? Thanks for your help!

Answer 1

dude....to be honest ive never had any formal lessons...nor do i know any of that stuff...but from a rogue players view...i do know that when ya run a scale the last note should be the same as the first note(ie... if you do a scale in e...it should end in e)...i was never really taught any of that....i was fortunate enough to be born with a good ear and copy cat skills.....theres only 2 rules in music as far as im concerned...
RULE #1: IF IT SOUNDS GOOD, IT IS GOOD
RULE #2: ANY QUESTIONS...SEE RULE #1
its worked for me for 20 years