The Em, E, and E7 chords have something in common. When you play these chords, you use your second finger on the fifth string at the second fret. Because this finger is used in each chord in the same place, it is called a common finger. When you change between any of those chords, you can leave your second finger where it is for a quicker
chord change.
Based on what you read which of the following could you assume is true?
Common fingers can be useful when changing between chords.
The Em, E, and E7 chords are exactly the same.
The Em, E, and E7 chords have nothing in common
Common fingers serve no purpose.