could overflow
Regular verb: overflow - overflowed- overflowed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could overflow
you could overflow
she could overflow
we could overflow
you could overflow
they could overflow 	I could be overflowing
you could be overflowing
she could be overflowing
we could be overflowing
you could be overflowing
they could be overflowing	I could have overflowed
you could have overflowed
she could have overflowed
we could have overflowed
you could have overflowed
they could have overflowed	I could have been overflowing
you could have been overflowing
she could have been overflowing
we could have been overflowing
you could have been overflowing
they could have been overflowing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not overflow
you could not overflow
she could not overflow
we could not overflow
you could not overflow
they could not overflow 	I could not be overflowing
you could not be overflowing
she could not be overflowing
we could not be overflowing
you could not be overflowing
they could not be overflowing	I could not have overflowed
you could not have overflowed
she could not have overflowed
we could not have overflowed
you could not have overflowed
they could not have overflowed	I could not have been overflowing
you could not have been overflowing
she could not have been overflowing
we could not have been overflowing
you could not have been overflowing
they could not have been overflowing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I overflow?
could you overflow?
could she overflow?
could we overflow?
could you overflow?
could they overflow? 	could I be overflowing?
could you be overflowing?
could she be overflowing?
could we be overflowing?
could you be overflowing?
could they be overflowing? 	could I have overflowed?
could you have overflowed?
could she have overflowed?
could we have overflowed?
could you have overflowed?
could they have overflowed? 	could I have been overflowing?
could you have been overflowing?
could she have been overflowing?
could we have been overflowing?
could you have been overflowing?
could they have been overflowing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not overflow?
could you not overflow?
could she not overflow?
could we not overflow?
could you not overflow?
could they not overflow? 	could I not be overflowing?
could you not be overflowing?
could she not be overflowing?
could we not be overflowing?
could you not be overflowing?
could they not be overflowing? 	could I not have overflowed?
could you not have overflowed?
could she not have overflowed?
could we not have overflowed?
could you not have overflowed?
could they not have overflowed? 	could I not have been overflowing?
could you not have been overflowing?
could she not have been overflowing?
could we not have been overflowing?
could you not have been overflowing?
could they not have been overflowing?