A7
To play the A7 chord, use the second and third fingers of your left hand as shown in the diagram, and strum all six strings.
Notice that the A7 chord is just an A Chord with the first finger lifted off.
Rhythm Pattern
When changing between C and A 7, the second finger acts as a pivot finger.
When you have practiced this chord progression, try it again with the following two-bar rhythm pattern.
Rhythm Pattern
Rhythm Pattern
E7
To play the E7 chord, use the first and second fingers of your left hand as shown in the diagram, and strum all six strings.
Notice that the E7 Chord is just an E chord with the third finger lifted off.
Rhythm Pattern
Rhythm Pattern