could abrade
Regular verb: abrade - abraded- abraded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could abrade
you could abrade
he could abrade
we could abrade
you could abrade
they could abrade 	I could be abrading
you could be abrading
he could be abrading
we could be abrading
you could be abrading
they could be abrading	I could have abraded
you could have abraded
he could have abraded
we could have abraded
you could have abraded
they could have abraded	I could have been abrading
you could have been abrading
he could have been abrading
we could have been abrading
you could have been abrading
they could have been abrading	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't abrade
you couldn't abrade
he couldn't abrade
we couldn't abrade
you couldn't abrade
they couldn't abrade 	I couldn't be abrading
you couldn't be abrading
he couldn't be abrading
we couldn't be abrading
you couldn't be abrading
they couldn't be abrading	I couldn't have abraded
you couldn't have abraded
he couldn't have abraded
we couldn't have abraded
you couldn't have abraded
they couldn't have abraded	I couldn't have been abrading
you couldn't have been abrading
he couldn't have been abrading
we couldn't have been abrading
you couldn't have been abrading
they couldn't have been abrading	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I abrade?
could you abrade?
could he abrade?
could we abrade?
could you abrade?
could they abrade? 	could I be abrading?
could you be abrading?
could he be abrading?
could we be abrading?
could you be abrading?
could they be abrading? 	could I have abraded?
could you have abraded?
could he have abraded?
could we have abraded?
could you have abraded?
could they have abraded? 	could I have been abrading?
could you have been abrading?
could he have been abrading?
could we have been abrading?
could you have been abrading?
could they have been abrading? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I abrade?
couldn't you abrade?
couldn't he abrade?
couldn't we abrade?
couldn't you abrade?
couldn't they abrade? 	couldn't I be abrading?
couldn't you be abrading?
couldn't he be abrading?
couldn't we be abrading?
couldn't you be abrading?
couldn't they be abrading? 	couldn't I have abraded?
couldn't you have abraded?
couldn't he have abraded?
couldn't we have abraded?
couldn't you have abraded?
couldn't they have abraded? 	couldn't I have been abrading?
couldn't you have been abrading?
couldn't he have been abrading?
couldn't we have been abrading?
couldn't you have been abrading?
couldn't they have been abrading?