could invalid invalid invalid invalid invalid invalid invalid invalid
Regular verb: invalid invalid invalid invalid invalid invalid invalid invalid - invalid invalid invalid invalid invalid invalid invalid invalided- invalid invalid invalid invalid invalid invalid invalid invalided

, this verb may not exist. Conjugation is given as example.

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could invalid invalid invalid invalid invalid invalid invalid invalid
you could invalid invalid invalid invalid invalid invalid invalid invalid
she could invalid invalid invalid invalid invalid invalid invalid invalid
we could invalid invalid invalid invalid invalid invalid invalid invalid
you could invalid invalid invalid invalid invalid invalid invalid invalid
they could invalid invalid invalid invalid invalid invalid invalid invalid 	I could be invalid invalid invalid invalid invalid invalid invalid invaliding
you could be invalid invalid invalid invalid invalid invalid invalid invaliding
she could be invalid invalid invalid invalid invalid invalid invalid invaliding
we could be invalid invalid invalid invalid invalid invalid invalid invaliding
you could be invalid invalid invalid invalid invalid invalid invalid invaliding
they could be invalid invalid invalid invalid invalid invalid invalid invaliding	I could have invalid invalid invalid invalid invalid invalid invalid invalided
you could have invalid invalid invalid invalid invalid invalid invalid invalided
she could have invalid invalid invalid invalid invalid invalid invalid invalided
we could have invalid invalid invalid invalid invalid invalid invalid invalided
you could have invalid invalid invalid invalid invalid invalid invalid invalided
they could have invalid invalid invalid invalid invalid invalid invalid invalided	I could have been invalid invalid invalid invalid invalid invalid invalid invaliding
you could have been invalid invalid invalid invalid invalid invalid invalid invaliding
she could have been invalid invalid invalid invalid invalid invalid invalid invaliding
we could have been invalid invalid invalid invalid invalid invalid invalid invaliding
you could have been invalid invalid invalid invalid invalid invalid invalid invaliding
they could have been invalid invalid invalid invalid invalid invalid invalid invaliding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't invalid invalid invalid invalid invalid invalid invalid invalid
you couldn't invalid invalid invalid invalid invalid invalid invalid invalid
she couldn't invalid invalid invalid invalid invalid invalid invalid invalid
we couldn't invalid invalid invalid invalid invalid invalid invalid invalid
you couldn't invalid invalid invalid invalid invalid invalid invalid invalid
they couldn't invalid invalid invalid invalid invalid invalid invalid invalid 	I couldn't be invalid invalid invalid invalid invalid invalid invalid invaliding
you couldn't be invalid invalid invalid invalid invalid invalid invalid invaliding
she couldn't be invalid invalid invalid invalid invalid invalid invalid invaliding
we couldn't be invalid invalid invalid invalid invalid invalid invalid invaliding
you couldn't be invalid invalid invalid invalid invalid invalid invalid invaliding
they couldn't be invalid invalid invalid invalid invalid invalid invalid invaliding	I couldn't have invalid invalid invalid invalid invalid invalid invalid invalided
you couldn't have invalid invalid invalid invalid invalid invalid invalid invalided
she couldn't have invalid invalid invalid invalid invalid invalid invalid invalided
we couldn't have invalid invalid invalid invalid invalid invalid invalid invalided
you couldn't have invalid invalid invalid invalid invalid invalid invalid invalided
they couldn't have invalid invalid invalid invalid invalid invalid invalid invalided	I couldn't have been invalid invalid invalid invalid invalid invalid invalid invaliding
you couldn't have been invalid invalid invalid invalid invalid invalid invalid invaliding
she couldn't have been invalid invalid invalid invalid invalid invalid invalid invaliding
we couldn't have been invalid invalid invalid invalid invalid invalid invalid invaliding
you couldn't have been invalid invalid invalid invalid invalid invalid invalid invaliding
they couldn't have been invalid invalid invalid invalid invalid invalid invalid invaliding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I invalid invalid invalid invalid invalid invalid invalid invalid?
could you invalid invalid invalid invalid invalid invalid invalid invalid?
could she invalid invalid invalid invalid invalid invalid invalid invalid?
could we invalid invalid invalid invalid invalid invalid invalid invalid?
could you invalid invalid invalid invalid invalid invalid invalid invalid?
could they invalid invalid invalid invalid invalid invalid invalid invalid? 	could I be invalid invalid invalid invalid invalid invalid invalid invaliding?
could you be invalid invalid invalid invalid invalid invalid invalid invaliding?
could she be invalid invalid invalid invalid invalid invalid invalid invaliding?
could we be invalid invalid invalid invalid invalid invalid invalid invaliding?
could you be invalid invalid invalid invalid invalid invalid invalid invaliding?
could they be invalid invalid invalid invalid invalid invalid invalid invaliding? 	could I have invalid invalid invalid invalid invalid invalid invalid invalided?
could you have invalid invalid invalid invalid invalid invalid invalid invalided?
could she have invalid invalid invalid invalid invalid invalid invalid invalided?
could we have invalid invalid invalid invalid invalid invalid invalid invalided?
could you have invalid invalid invalid invalid invalid invalid invalid invalided?
could they have invalid invalid invalid invalid invalid invalid invalid invalided? 	could I have been invalid invalid invalid invalid invalid invalid invalid invaliding?
could you have been invalid invalid invalid invalid invalid invalid invalid invaliding?
could she have been invalid invalid invalid invalid invalid invalid invalid invaliding?
could we have been invalid invalid invalid invalid invalid invalid invalid invaliding?
could you have been invalid invalid invalid invalid invalid invalid invalid invaliding?
could they have been invalid invalid invalid invalid invalid invalid invalid invaliding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I invalid invalid invalid invalid invalid invalid invalid invalid?
couldn't you invalid invalid invalid invalid invalid invalid invalid invalid?
couldn't she invalid invalid invalid invalid invalid invalid invalid invalid?
couldn't we invalid invalid invalid invalid invalid invalid invalid invalid?
couldn't you invalid invalid invalid invalid invalid invalid invalid invalid?
couldn't they invalid invalid invalid invalid invalid invalid invalid invalid? 	couldn't I be invalid invalid invalid invalid invalid invalid invalid invaliding?
couldn't you be invalid invalid invalid invalid invalid invalid invalid invaliding?
couldn't she be invalid invalid invalid invalid invalid invalid invalid invaliding?
couldn't we be invalid invalid invalid invalid invalid invalid invalid invaliding?
couldn't you be invalid invalid invalid invalid invalid invalid invalid invaliding?
couldn't they be invalid invalid invalid invalid invalid invalid invalid invaliding? 	couldn't I have invalid invalid invalid invalid invalid invalid invalid invalided?
couldn't you have invalid invalid invalid invalid invalid invalid invalid invalided?
couldn't she have invalid invalid invalid invalid invalid invalid invalid invalided?
couldn't we have invalid invalid invalid invalid invalid invalid invalid invalided?
couldn't you have invalid invalid invalid invalid invalid invalid invalid invalided?
couldn't they have invalid invalid invalid invalid invalid invalid invalid invalided? 	couldn't I have been invalid invalid invalid invalid invalid invalid invalid invaliding?
couldn't you have been invalid invalid invalid invalid invalid invalid invalid invaliding?
couldn't she have been invalid invalid invalid invalid invalid invalid invalid invaliding?
couldn't we have been invalid invalid invalid invalid invalid invalid invalid invaliding?
couldn't you have been invalid invalid invalid invalid invalid invalid invalid invaliding?
couldn't they have been invalid invalid invalid invalid invalid invalid invalid invaliding?