Объедините 2 предложения в одно: 1) he passed the driving test (after) he bought a car. 2) the teacher fell ill (before) the course began 3) (after) they cancelled their booking. somebody bought the tickets. 4) he suggested that (after) you signed the contract. 5) he resigned (by the time) they decided to fire him.

He passed the driving test after he had bought a car
The teacher felt ill before the course began
After they have cancelled their booking, somebody bought their tickets
He suggested that after you have signed the contract
He has resigned by the time they decided to fire him