could balloon
Regular verb: balloon - ballooned- ballooned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could balloon
you could balloon
she could balloon
we could balloon
you could balloon
they could balloon 	I could be ballooning
you could be ballooning
she could be ballooning
we could be ballooning
you could be ballooning
they could be ballooning	I could have ballooned
you could have ballooned
she could have ballooned
we could have ballooned
you could have ballooned
they could have ballooned	I could have been ballooning
you could have been ballooning
she could have been ballooning
we could have been ballooning
you could have been ballooning
they could have been ballooning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not balloon
you could not balloon
she could not balloon
we could not balloon
you could not balloon
they could not balloon 	I could not be ballooning
you could not be ballooning
she could not be ballooning
we could not be ballooning
you could not be ballooning
they could not be ballooning	I could not have ballooned
you could not have ballooned
she could not have ballooned
we could not have ballooned
you could not have ballooned
they could not have ballooned	I could not have been ballooning
you could not have been ballooning
she could not have been ballooning
we could not have been ballooning
you could not have been ballooning
they could not have been ballooning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I balloon?
could you balloon?
could she balloon?
could we balloon?
could you balloon?
could they balloon? 	could I be ballooning?
could you be ballooning?
could she be ballooning?
could we be ballooning?
could you be ballooning?
could they be ballooning? 	could I have ballooned?
could you have ballooned?
could she have ballooned?
could we have ballooned?
could you have ballooned?
could they have ballooned? 	could I have been ballooning?
could you have been ballooning?
could she have been ballooning?
could we have been ballooning?
could you have been ballooning?
could they have been ballooning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not balloon?
could you not balloon?
could she not balloon?
could we not balloon?
could you not balloon?
could they not balloon? 	could I not be ballooning?
could you not be ballooning?
could she not be ballooning?
could we not be ballooning?
could you not be ballooning?
could they not be ballooning? 	could I not have ballooned?
could you not have ballooned?
could she not have ballooned?
could we not have ballooned?
could you not have ballooned?
could they not have ballooned? 	could I not have been ballooning?
could you not have been ballooning?
could she not have been ballooning?
could we not have been ballooning?
could you not have been ballooning?
could they not have been ballooning?