could interlineate
Regular verb: interlineate - interlineated- interlineated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could interlineate
you could interlineate
she could interlineate
we could interlineate
you could interlineate
they could interlineate 	I could be interlineating
you could be interlineating
she could be interlineating
we could be interlineating
you could be interlineating
they could be interlineating	I could have interlineated
you could have interlineated
she could have interlineated
we could have interlineated
you could have interlineated
they could have interlineated	I could have been interlineating
you could have been interlineating
she could have been interlineating
we could have been interlineating
you could have been interlineating
they could have been interlineating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't interlineate
you couldn't interlineate
she couldn't interlineate
we couldn't interlineate
you couldn't interlineate
they couldn't interlineate 	I couldn't be interlineating
you couldn't be interlineating
she couldn't be interlineating
we couldn't be interlineating
you couldn't be interlineating
they couldn't be interlineating	I couldn't have interlineated
you couldn't have interlineated
she couldn't have interlineated
we couldn't have interlineated
you couldn't have interlineated
they couldn't have interlineated	I couldn't have been interlineating
you couldn't have been interlineating
she couldn't have been interlineating
we couldn't have been interlineating
you couldn't have been interlineating
they couldn't have been interlineating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I interlineate?
could you interlineate?
could she interlineate?
could we interlineate?
could you interlineate?
could they interlineate? 	could I be interlineating?
could you be interlineating?
could she be interlineating?
could we be interlineating?
could you be interlineating?
could they be interlineating? 	could I have interlineated?
could you have interlineated?
could she have interlineated?
could we have interlineated?
could you have interlineated?
could they have interlineated? 	could I have been interlineating?
could you have been interlineating?
could she have been interlineating?
could we have been interlineating?
could you have been interlineating?
could they have been interlineating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I interlineate?
couldn't you interlineate?
couldn't she interlineate?
couldn't we interlineate?
couldn't you interlineate?
couldn't they interlineate? 	couldn't I be interlineating?
couldn't you be interlineating?
couldn't she be interlineating?
couldn't we be interlineating?
couldn't you be interlineating?
couldn't they be interlineating? 	couldn't I have interlineated?
couldn't you have interlineated?
couldn't she have interlineated?
couldn't we have interlineated?
couldn't you have interlineated?
couldn't they have interlineated? 	couldn't I have been interlineating?
couldn't you have been interlineating?
couldn't she have been interlineating?
couldn't we have been interlineating?
couldn't you have been interlineating?
couldn't they have been interlineating?