Questions About Harmonizing The Major Scale ? Options

[waqsfeu]

I am learning the Harmonizing the major scale lesson and I have some questions.
If it is not the right place to post it, tell me and I will deplace it.

First I wanted to say that I have already watched all the triads lessons.
I just learn that for improvising on a G scale we had to create chords from the scale, I have not seen that with my teacher yet.

"When you do it you will get these chords:
G major = G A B C D E F# => Gmaj - Amin - Bmin - Cmaj - Dmaj - Emin - F#dim"

1) How do you know which chords is minor, major or diminished ?
2) Is there a lesson on GMC.net about the degree thing ? Why can't we just play all along th G major scale on the neck of the bass ?
3)Imagine, I play with friends, the guitarist start playing some chords, for example G D E E, how can I know if have to play notes on triads, arpeggios or on the pentatonic, or on the whole scale ?
4)That apply for a G major key music, right ? But how can you know that the chords in the music will be Gmaj then Amin then Bmin, etc... ?

Sorry to ask so many questions but I have learn a lot here and I am close to put my bass play a level higher.

Thanks

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This post has been edited by waqsfeu: Oct 30 2008, 12:08 AM