could gamble
Regular verb: gamble - gambled- gambled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could gamble
you could gamble
he could gamble
we could gamble
you could gamble
they could gamble 	I could be gambling
you could be gambling
he could be gambling
we could be gambling
you could be gambling
they could be gambling	I could have gambled
you could have gambled
he could have gambled
we could have gambled
you could have gambled
they could have gambled	I could have been gambling
you could have been gambling
he could have been gambling
we could have been gambling
you could have been gambling
they could have been gambling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not gamble
you could not gamble
he could not gamble
we could not gamble
you could not gamble
they could not gamble 	I could not be gambling
you could not be gambling
he could not be gambling
we could not be gambling
you could not be gambling
they could not be gambling	I could not have gambled
you could not have gambled
he could not have gambled
we could not have gambled
you could not have gambled
they could not have gambled	I could not have been gambling
you could not have been gambling
he could not have been gambling
we could not have been gambling
you could not have been gambling
they could not have been gambling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I gamble?
could you gamble?
could he gamble?
could we gamble?
could you gamble?
could they gamble? 	could I be gambling?
could you be gambling?
could he be gambling?
could we be gambling?
could you be gambling?
could they be gambling? 	could I have gambled?
could you have gambled?
could he have gambled?
could we have gambled?
could you have gambled?
could they have gambled? 	could I have been gambling?
could you have been gambling?
could he have been gambling?
could we have been gambling?
could you have been gambling?
could they have been gambling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not gamble?
could you not gamble?
could he not gamble?
could we not gamble?
could you not gamble?
could they not gamble? 	could I not be gambling?
could you not be gambling?
could he not be gambling?
could we not be gambling?
could you not be gambling?
could they not be gambling? 	could I not have gambled?
could you not have gambled?
could he not have gambled?
could we not have gambled?
could you not have gambled?
could they not have gambled? 	could I not have been gambling?
could you not have been gambling?
could he not have been gambling?
could we not have been gambling?
could you not have been gambling?
could they not have been gambling?