1)Missed or hit ball “off-Centre”

A) Watch-ball say “throw hit”

2)Ball went too high or too long

A) Contact Point too late
B) Ball-toss
C) Reach-up/Back-scratch
D) Wrong Grip

3)Ball went into net

A) Contact Point too early
B) Ball-toss
C) Reach-up/Back-scratch
D) Wrong Grip

4)Ball went  wide

A) Hitting position not side on
B) Racquet face not “square” to ball