WHEN I SAW HIM(PLAY/PLAYING/TO PLAY/WAS PLAYING)VIDEO GAME,I(WALKING...

4. - KIEM TRA TOAN BO ANH 8
KIEM TRA TOAN BO ANH 8

4.When I saw him(play/playing/to play/was playing)video game,I(walking/walked/was walking/walked) home.