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 couldn't dab
you couldn't dab
she couldn't dab
we couldn't dab
you couldn't dab
they couldn't dab 	I couldn't be dabbing
you couldn't be dabbing
she couldn't be dabbing
we couldn't be dabbing
you couldn't be dabbing
they couldn't be dabbing	I couldn't have dabbed
you couldn't have dabbed
she couldn't have dabbed
we couldn't have dabbed
you couldn't have dabbed
they couldn't have dabbed	I couldn't have been dabbing
you couldn't have been dabbing
she couldn't have been dabbing
we couldn't have been dabbing
you couldn't have been dabbing
they couldn't 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 	
couldn't I dab?
couldn't you dab?
couldn't she dab?
couldn't we dab?
couldn't you dab?
couldn't they dab? 	couldn't I be dabbing?
couldn't you be dabbing?
couldn't she be dabbing?
couldn't we be dabbing?
couldn't you be dabbing?
couldn't they be dabbing? 	couldn't I have dabbed?
couldn't you have dabbed?
couldn't she have dabbed?
couldn't we have dabbed?
couldn't you have dabbed?
couldn't they have dabbed? 	couldn't I have been dabbing?
couldn't you have been dabbing?
couldn't she have been dabbing?
couldn't we have been dabbing?
couldn't you have been dabbing?
couldn't they have been dabbing?