could quill
Regular verb: quill - quilled- quilled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could quill
you could quill
he could quill
we could quill
you could quill
they could quill 	I could be quilling
you could be quilling
he could be quilling
we could be quilling
you could be quilling
they could be quilling	I could have quilled
you could have quilled
he could have quilled
we could have quilled
you could have quilled
they could have quilled	I could have been quilling
you could have been quilling
he could have been quilling
we could have been quilling
you could have been quilling
they could have been quilling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't quill
you couldn't quill
he couldn't quill
we couldn't quill
you couldn't quill
they couldn't quill 	I couldn't be quilling
you couldn't be quilling
he couldn't be quilling
we couldn't be quilling
you couldn't be quilling
they couldn't be quilling	I couldn't have quilled
you couldn't have quilled
he couldn't have quilled
we couldn't have quilled
you couldn't have quilled
they couldn't have quilled	I couldn't have been quilling
you couldn't have been quilling
he couldn't have been quilling
we couldn't have been quilling
you couldn't have been quilling
they couldn't have been quilling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I quill?
could you quill?
could he quill?
could we quill?
could you quill?
could they quill? 	could I be quilling?
could you be quilling?
could he be quilling?
could we be quilling?
could you be quilling?
could they be quilling? 	could I have quilled?
could you have quilled?
could he have quilled?
could we have quilled?
could you have quilled?
could they have quilled? 	could I have been quilling?
could you have been quilling?
could he have been quilling?
could we have been quilling?
could you have been quilling?
could they have been quilling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I quill?
couldn't you quill?
couldn't he quill?
couldn't we quill?
couldn't you quill?
couldn't they quill? 	couldn't I be quilling?
couldn't you be quilling?
couldn't he be quilling?
couldn't we be quilling?
couldn't you be quilling?
couldn't they be quilling? 	couldn't I have quilled?
couldn't you have quilled?
couldn't he have quilled?
couldn't we have quilled?
couldn't you have quilled?
couldn't they have quilled? 	couldn't I have been quilling?
couldn't you have been quilling?
couldn't he have been quilling?
couldn't we have been quilling?
couldn't you have been quilling?
couldn't they have been quilling?