could slough
Regular verb: slough - sloughed- sloughed

Affirmation 	
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I could slough
you could slough
he could slough
we could slough
you could slough
they could slough 	I could be sloughing
you could be sloughing
he could be sloughing
we could be sloughing
you could be sloughing
they could be sloughing	I could have sloughed
you could have sloughed
he could have sloughed
we could have sloughed
you could have sloughed
they could have sloughed	I could have been sloughing
you could have been sloughing
he could have been sloughing
we could have been sloughing
you could have been sloughing
they could have been sloughing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't slough
you couldn't slough
he couldn't slough
we couldn't slough
you couldn't slough
they couldn't slough 	I couldn't be sloughing
you couldn't be sloughing
he couldn't be sloughing
we couldn't be sloughing
you couldn't be sloughing
they couldn't be sloughing	I couldn't have sloughed
you couldn't have sloughed
he couldn't have sloughed
we couldn't have sloughed
you couldn't have sloughed
they couldn't have sloughed	I couldn't have been sloughing
you couldn't have been sloughing
he couldn't have been sloughing
we couldn't have been sloughing
you couldn't have been sloughing
they couldn't have been sloughing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I slough?
could you slough?
could he slough?
could we slough?
could you slough?
could they slough? 	could I be sloughing?
could you be sloughing?
could he be sloughing?
could we be sloughing?
could you be sloughing?
could they be sloughing? 	could I have sloughed?
could you have sloughed?
could he have sloughed?
could we have sloughed?
could you have sloughed?
could they have sloughed? 	could I have been sloughing?
could you have been sloughing?
could he have been sloughing?
could we have been sloughing?
could you have been sloughing?
could they have been sloughing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I slough?
couldn't you slough?
couldn't he slough?
couldn't we slough?
couldn't you slough?
couldn't they slough? 	couldn't I be sloughing?
couldn't you be sloughing?
couldn't he be sloughing?
couldn't we be sloughing?
couldn't you be sloughing?
couldn't they be sloughing? 	couldn't I have sloughed?
couldn't you have sloughed?
couldn't he have sloughed?
couldn't we have sloughed?
couldn't you have sloughed?
couldn't they have sloughed? 	couldn't I have been sloughing?
couldn't you have been sloughing?
couldn't he have been sloughing?
couldn't we have been sloughing?
couldn't you have been sloughing?
couldn't they have been sloughing?