could slab
Regular verb: slab - slabed- slabed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could slab
you could slab
he could slab
we could slab
you could slab
they could slab 	I could be slabing
you could be slabing
he could be slabing
we could be slabing
you could be slabing
they could be slabing	I could have slabed
you could have slabed
he could have slabed
we could have slabed
you could have slabed
they could have slabed	I could have been slabing
you could have been slabing
he could have been slabing
we could have been slabing
you could have been slabing
they could have been slabing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't slab
you couldn't slab
he couldn't slab
we couldn't slab
you couldn't slab
they couldn't slab 	I couldn't be slabing
you couldn't be slabing
he couldn't be slabing
we couldn't be slabing
you couldn't be slabing
they couldn't be slabing	I couldn't have slabed
you couldn't have slabed
he couldn't have slabed
we couldn't have slabed
you couldn't have slabed
they couldn't have slabed	I couldn't have been slabing
you couldn't have been slabing
he couldn't have been slabing
we couldn't have been slabing
you couldn't have been slabing
they couldn't have been slabing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I slab?
could you slab?
could he slab?
could we slab?
could you slab?
could they slab? 	could I be slabing?
could you be slabing?
could he be slabing?
could we be slabing?
could you be slabing?
could they be slabing? 	could I have slabed?
could you have slabed?
could he have slabed?
could we have slabed?
could you have slabed?
could they have slabed? 	could I have been slabing?
could you have been slabing?
could he have been slabing?
could we have been slabing?
could you have been slabing?
could they have been slabing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I slab?
couldn't you slab?
couldn't he slab?
couldn't we slab?
couldn't you slab?
couldn't they slab? 	couldn't I be slabing?
couldn't you be slabing?
couldn't he be slabing?
couldn't we be slabing?
couldn't you be slabing?
couldn't they be slabing? 	couldn't I have slabed?
couldn't you have slabed?
couldn't he have slabed?
couldn't we have slabed?
couldn't you have slabed?
couldn't they have slabed? 	couldn't I have been slabing?
couldn't you have been slabing?
couldn't he have been slabing?
couldn't we have been slabing?
couldn't you have been slabing?
couldn't they have been slabing?