could pencil
Regular verb: pencil - pencilled- pencilled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could pencil
you could pencil
he could pencil
we could pencil
you could pencil
they could pencil 	I could be pencilling
you could be pencilling
he could be pencilling
we could be pencilling
you could be pencilling
they could be pencilling	I could have pencilled
you could have pencilled
he could have pencilled
we could have pencilled
you could have pencilled
they could have pencilled	I could have been pencilling
you could have been pencilling
he could have been pencilling
we could have been pencilling
you could have been pencilling
they could have been pencilling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not pencil
you could not pencil
he could not pencil
we could not pencil
you could not pencil
they could not pencil 	I could not be pencilling
you could not be pencilling
he could not be pencilling
we could not be pencilling
you could not be pencilling
they could not be pencilling	I could not have pencilled
you could not have pencilled
he could not have pencilled
we could not have pencilled
you could not have pencilled
they could not have pencilled	I could not have been pencilling
you could not have been pencilling
he could not have been pencilling
we could not have been pencilling
you could not have been pencilling
they could not have been pencilling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I pencil?
could you pencil?
could he pencil?
could we pencil?
could you pencil?
could they pencil? 	could I be pencilling?
could you be pencilling?
could he be pencilling?
could we be pencilling?
could you be pencilling?
could they be pencilling? 	could I have pencilled?
could you have pencilled?
could he have pencilled?
could we have pencilled?
could you have pencilled?
could they have pencilled? 	could I have been pencilling?
could you have been pencilling?
could he have been pencilling?
could we have been pencilling?
could you have been pencilling?
could they have been pencilling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not pencil?
could you not pencil?
could he not pencil?
could we not pencil?
could you not pencil?
could they not pencil? 	could I not be pencilling?
could you not be pencilling?
could he not be pencilling?
could we not be pencilling?
could you not be pencilling?
could they not be pencilling? 	could I not have pencilled?
could you not have pencilled?
could he not have pencilled?
could we not have pencilled?
could you not have pencilled?
could they not have pencilled? 	could I not have been pencilling?
could you not have been pencilling?
could he not have been pencilling?
could we not have been pencilling?
could you not have been pencilling?
could they not have been pencilling?