could dab
Regular verb: dab - dabbed- dabbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could dab
you could dab
she could dab
we could dab
you could dab
they could dab 	I could be dabbing
you could be dabbing
she could be dabbing
we could be dabbing
you could be dabbing
they could be dabbing	I could have dabbed
you could have dabbed
she could have dabbed
we could have dabbed
you could have dabbed
they could have dabbed	I could have been dabbing
you could have been dabbing
she could have been dabbing
we could have been dabbing
you could have been dabbing
they could have been dabbing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not dab
you could not dab
she could not dab
we could not dab
you could not dab
they could not dab 	I could not be dabbing
you could not be dabbing
she could not be dabbing
we could not be dabbing
you could not be dabbing
they could not be dabbing	I could not have dabbed
you could not have dabbed
she could not have dabbed
we could not have dabbed
you could not have dabbed
they could not have dabbed	I could not have been dabbing
you could not have been dabbing
she could not have been dabbing
we could not have been dabbing
you could not have been dabbing
they could not have been dabbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I dab?
could you dab?
could she dab?
could we dab?
could you dab?
could they dab? 	could I be dabbing?
could you be dabbing?
could she be dabbing?
could we be dabbing?
could you be dabbing?
could they be dabbing? 	could I have dabbed?
could you have dabbed?
could she have dabbed?
could we have dabbed?
could you have dabbed?
could they have dabbed? 	could I have been dabbing?
could you have been dabbing?
could she have been dabbing?
could we have been dabbing?
could you have been dabbing?
could they have been dabbing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not dab?
could you not dab?
could she not dab?
could we not dab?
could you not dab?
could they not dab? 	could I not be dabbing?
could you not be dabbing?
could she not be dabbing?
could we not be dabbing?
could you not be dabbing?
could they not be dabbing? 	could I not have dabbed?
could you not have dabbed?
could she not have dabbed?
could we not have dabbed?
could you not have dabbed?
could they not have dabbed? 	could I not have been dabbing?
could you not have been dabbing?
could she not have been dabbing?
could we not have been dabbing?
could you not have been dabbing?
could they not have been dabbing?