Marry- Marrying- Married- Married
Fright- Frightening- Frightened- Frightened
Die- Dying- Died- Died
Meet- Meeting- Met- Met
Retire- Retiring- Retired- Retired
Think- Thinking- Thought- Thought
Stop- Stopping- Stopped- Stopped
Ride- Riding- Rode- Ridden
Fall- Falling- Fell- Fallen
Learn- Learning- Learned- Learned.