1 mary has visited his grandparents ⇒vì mary =he/she +has +v3 thì visit--visited

2jack has played game on the computer⇔jack=he +has+v3 thì play-played

3john and su have washed their car⇔vì john and su=they +have +v3 

4andrew has repaired his bike⇒vì andrew =he +has+v3

• Mary has visited her grandparents.
• Jack has played games on the computer.
• John and Su have washed their car.
• Andrew has repaired his bike.

1 mary has visited his grandparents ⇒vì mary =he/she +has +v3 thì visit--visited

2jack has played game on the computer⇔jack=he +has+v3 thì play-played

3john and su have washed their car⇔vì john and su=they +have +v3 

1. Mary has visited his grandparents

2. Jack has played games on the computer

3. John and Su have washed their car 

4. Andrew has repaired his bike

• Mary has visited her grandparents.
• Jack has played games on the computer.
• John and Su have washed their car.
• Andrew has repaired his bike.