could elaborate
Regular verb: elaborate - elaborated- elaborated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could elaborate
you could elaborate
she could elaborate
we could elaborate
you could elaborate
they could elaborate 	I could be elaborating
you could be elaborating
she could be elaborating
we could be elaborating
you could be elaborating
they could be elaborating	I could have elaborated
you could have elaborated
she could have elaborated
we could have elaborated
you could have elaborated
they could have elaborated	I could have been elaborating
you could have been elaborating
she could have been elaborating
we could have been elaborating
you could have been elaborating
they could have been elaborating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't elaborate
you couldn't elaborate
she couldn't elaborate
we couldn't elaborate
you couldn't elaborate
they couldn't elaborate 	I couldn't be elaborating
you couldn't be elaborating
she couldn't be elaborating
we couldn't be elaborating
you couldn't be elaborating
they couldn't be elaborating	I couldn't have elaborated
you couldn't have elaborated
she couldn't have elaborated
we couldn't have elaborated
you couldn't have elaborated
they couldn't have elaborated	I couldn't have been elaborating
you couldn't have been elaborating
she couldn't have been elaborating
we couldn't have been elaborating
you couldn't have been elaborating
they couldn't have been elaborating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I elaborate?
could you elaborate?
could she elaborate?
could we elaborate?
could you elaborate?
could they elaborate? 	could I be elaborating?
could you be elaborating?
could she be elaborating?
could we be elaborating?
could you be elaborating?
could they be elaborating? 	could I have elaborated?
could you have elaborated?
could she have elaborated?
could we have elaborated?
could you have elaborated?
could they have elaborated? 	could I have been elaborating?
could you have been elaborating?
could she have been elaborating?
could we have been elaborating?
could you have been elaborating?
could they have been elaborating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I elaborate?
couldn't you elaborate?
couldn't she elaborate?
couldn't we elaborate?
couldn't you elaborate?
couldn't they elaborate? 	couldn't I be elaborating?
couldn't you be elaborating?
couldn't she be elaborating?
couldn't we be elaborating?
couldn't you be elaborating?
couldn't they be elaborating? 	couldn't I have elaborated?
couldn't you have elaborated?
couldn't she have elaborated?
couldn't we have elaborated?
couldn't you have elaborated?
couldn't they have elaborated? 	couldn't I have been elaborating?
couldn't you have been elaborating?
couldn't she have been elaborating?
couldn't we have been elaborating?
couldn't you have been elaborating?
couldn't they have been elaborating?