The past simple of "FORGET" is "FORGOTTEN"
The past simple of "HIT" is "HIT"
The past simple of " FALL" is "FELL"
The past simple of " LEAVE" is "LEAFT"
The past simple of "FLY" is "FLOW"
The past simple of "DRAW" is " DROW"
The past simple of "SING" is "SUNG"
The past simple of "MUST" is "HAD TO"
The past simple of "RIDE" is "RODE"
The past simple of " THINK" IS "THANK"