could distil
Regular verb: distil - distiled- distiled

Affirmation 	
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I could distil
you could distil
he could distil
we could distil
you could distil
they could distil 	I could be distiling
you could be distiling
he could be distiling
we could be distiling
you could be distiling
they could be distiling	I could have distiled
you could have distiled
he could have distiled
we could have distiled
you could have distiled
they could have distiled	I could have been distiling
you could have been distiling
he could have been distiling
we could have been distiling
you could have been distiling
they could have been distiling	

Negation 	
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I couldn't distil
you couldn't distil
he couldn't distil
we couldn't distil
you couldn't distil
they couldn't distil 	I couldn't be distiling
you couldn't be distiling
he couldn't be distiling
we couldn't be distiling
you couldn't be distiling
they couldn't be distiling	I couldn't have distiled
you couldn't have distiled
he couldn't have distiled
we couldn't have distiled
you couldn't have distiled
they couldn't have distiled	I couldn't have been distiling
you couldn't have been distiling
he couldn't have been distiling
we couldn't have been distiling
you couldn't have been distiling
they couldn't have been distiling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I distil?
could you distil?
could he distil?
could we distil?
could you distil?
could they distil? 	could I be distiling?
could you be distiling?
could he be distiling?
could we be distiling?
could you be distiling?
could they be distiling? 	could I have distiled?
could you have distiled?
could he have distiled?
could we have distiled?
could you have distiled?
could they have distiled? 	could I have been distiling?
could you have been distiling?
could he have been distiling?
could we have been distiling?
could you have been distiling?
could they have been distiling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I distil?
couldn't you distil?
couldn't he distil?
couldn't we distil?
couldn't you distil?
couldn't they distil? 	couldn't I be distiling?
couldn't you be distiling?
couldn't he be distiling?
couldn't we be distiling?
couldn't you be distiling?
couldn't they be distiling? 	couldn't I have distiled?
couldn't you have distiled?
couldn't he have distiled?
couldn't we have distiled?
couldn't you have distiled?
couldn't they have distiled? 	couldn't I have been distiling?
couldn't you have been distiling?
couldn't he have been distiling?
couldn't we have been distiling?
couldn't you have been distiling?
couldn't they have been distiling?