could philter
Regular verb: philter - philtered- philtered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could philter
you could philter
he could philter
we could philter
you could philter
they could philter 	I could be philtering
you could be philtering
he could be philtering
we could be philtering
you could be philtering
they could be philtering	I could have philtered
you could have philtered
he could have philtered
we could have philtered
you could have philtered
they could have philtered	I could have been philtering
you could have been philtering
he could have been philtering
we could have been philtering
you could have been philtering
they could have been philtering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't philter
you couldn't philter
he couldn't philter
we couldn't philter
you couldn't philter
they couldn't philter 	I couldn't be philtering
you couldn't be philtering
he couldn't be philtering
we couldn't be philtering
you couldn't be philtering
they couldn't be philtering	I couldn't have philtered
you couldn't have philtered
he couldn't have philtered
we couldn't have philtered
you couldn't have philtered
they couldn't have philtered	I couldn't have been philtering
you couldn't have been philtering
he couldn't have been philtering
we couldn't have been philtering
you couldn't have been philtering
they couldn't have been philtering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I philter?
could you philter?
could he philter?
could we philter?
could you philter?
could they philter? 	could I be philtering?
could you be philtering?
could he be philtering?
could we be philtering?
could you be philtering?
could they be philtering? 	could I have philtered?
could you have philtered?
could he have philtered?
could we have philtered?
could you have philtered?
could they have philtered? 	could I have been philtering?
could you have been philtering?
could he have been philtering?
could we have been philtering?
could you have been philtering?
could they have been philtering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I philter?
couldn't you philter?
couldn't he philter?
couldn't we philter?
couldn't you philter?
couldn't they philter? 	couldn't I be philtering?
couldn't you be philtering?
couldn't he be philtering?
couldn't we be philtering?
couldn't you be philtering?
couldn't they be philtering? 	couldn't I have philtered?
couldn't you have philtered?
couldn't he have philtered?
couldn't we have philtered?
couldn't you have philtered?
couldn't they have philtered? 	couldn't I have been philtering?
couldn't you have been philtering?
couldn't he have been philtering?
couldn't we have been philtering?
couldn't you have been philtering?
couldn't they have been philtering?