In Lesson 18 the formula for the major chord was introduced (I - III - V). The formula for a minor chord is I - b III - V. Thus the only difference between a major and a minor chord is the flattened third note; e.g., consider the C and Cm chords:
Now, looking at the E major scale:
The E major and E minor chords contain the notes:
Construct the following minor chords: