They could have won the match. Change into passive voice.
AThe match could have been won by them.
BThe match have been won by them.
CThe match could be won by them.
DThe match could won.
AThe match could have been won by them.
BThe match have been won by them.
CThe match could be won by them.
DThe match could won.
Related Questions:
The Passive Voice of :-
His character worries me .
Turn into the Passive :
She knows the musician personally
Change into passive voice .
Do it .