In my Intervals and my Chord Construction Series we saw that you build chords by using every other note
of a given scale.
You can continue this "every other note" process by building a chord from each note of a Major Scale.
Since there is seven notes in a Major Scale, building a chord from each note can give you 7 possible chords
within the Major Scale. A chord for each note.
This process consists of thinking of each note within the Major Scale as a new Root Note. Now you can build chords starting at each Root using the Intervals of the original Major Scale and starting from that note's
place in the Major Scale. I'll show you examples shortly.
Using the "every other note concept" from my Chord Construction Series, As with building any chord from a scale, every other note ends up being the 1, 3, 5, 7, 9, 11, and 13 Intervals/note of a two octave scale.
By doing this you'll be able to see which Modes are Major and which Modes are Minor, which Modes create maj7 chords, which Modes create m7 chords, and which Modes create dominant 7 chords.