could lose
Irregular verb: lose - lost- lost

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could lose
you could lose
he could lose
we could lose
you could lose
they could lose 	I could be losing
you could be losing
he could be losing
we could be losing
you could be losing
they could be losing	I could have lost
you could have lost
he could have lost
we could have lost
you could have lost
they could have lost	I could have been losing
you could have been losing
he could have been losing
we could have been losing
you could have been losing
they could have been losing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't lose
you couldn't lose
he couldn't lose
we couldn't lose
you couldn't lose
they couldn't lose 	I couldn't be losing
you couldn't be losing
he couldn't be losing
we couldn't be losing
you couldn't be losing
they couldn't be losing	I couldn't have lost
you couldn't have lost
he couldn't have lost
we couldn't have lost
you couldn't have lost
they couldn't have lost	I couldn't have been losing
you couldn't have been losing
he couldn't have been losing
we couldn't have been losing
you couldn't have been losing
they couldn't have been losing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I lose?
could you lose?
could he lose?
could we lose?
could you lose?
could they lose? 	could I be losing?
could you be losing?
could he be losing?
could we be losing?
could you be losing?
could they be losing? 	could I have lost?
could you have lost?
could he have lost?
could we have lost?
could you have lost?
could they have lost? 	could I have been losing?
could you have been losing?
could he have been losing?
could we have been losing?
could you have been losing?
could they have been losing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I lose?
couldn't you lose?
couldn't he lose?
couldn't we lose?
couldn't you lose?
couldn't they lose? 	couldn't I be losing?
couldn't you be losing?
couldn't he be losing?
couldn't we be losing?
couldn't you be losing?
couldn't they be losing? 	couldn't I have lost?
couldn't you have lost?
couldn't he have lost?
couldn't we have lost?
couldn't you have lost?
couldn't they have lost? 	couldn't I have been losing?
couldn't you have been losing?
couldn't he have been losing?
couldn't we have been losing?
couldn't you have been losing?
couldn't they have been losing?