could slat
Regular verb: slat - slatted- slatted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could slat
you could slat
he could slat
we could slat
you could slat
they could slat 	I could be slatting
you could be slatting
he could be slatting
we could be slatting
you could be slatting
they could be slatting	I could have slatted
you could have slatted
he could have slatted
we could have slatted
you could have slatted
they could have slatted	I could have been slatting
you could have been slatting
he could have been slatting
we could have been slatting
you could have been slatting
they could have been slatting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't slat
you couldn't slat
he couldn't slat
we couldn't slat
you couldn't slat
they couldn't slat 	I couldn't be slatting
you couldn't be slatting
he couldn't be slatting
we couldn't be slatting
you couldn't be slatting
they couldn't be slatting	I couldn't have slatted
you couldn't have slatted
he couldn't have slatted
we couldn't have slatted
you couldn't have slatted
they couldn't have slatted	I couldn't have been slatting
you couldn't have been slatting
he couldn't have been slatting
we couldn't have been slatting
you couldn't have been slatting
they couldn't have been slatting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I slat?
could you slat?
could he slat?
could we slat?
could you slat?
could they slat? 	could I be slatting?
could you be slatting?
could he be slatting?
could we be slatting?
could you be slatting?
could they be slatting? 	could I have slatted?
could you have slatted?
could he have slatted?
could we have slatted?
could you have slatted?
could they have slatted? 	could I have been slatting?
could you have been slatting?
could he have been slatting?
could we have been slatting?
could you have been slatting?
could they have been slatting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I slat?
couldn't you slat?
couldn't he slat?
couldn't we slat?
couldn't you slat?
couldn't they slat? 	couldn't I be slatting?
couldn't you be slatting?
couldn't he be slatting?
couldn't we be slatting?
couldn't you be slatting?
couldn't they be slatting? 	couldn't I have slatted?
couldn't you have slatted?
couldn't he have slatted?
couldn't we have slatted?
couldn't you have slatted?
couldn't they have slatted? 	couldn't I have been slatting?
couldn't you have been slatting?
couldn't he have been slatting?
couldn't we have been slatting?
couldn't you have been slatting?
couldn't they have been slatting?