could kern
Regular verb: kern - kerned- kerned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could kern
you could kern
she could kern
we could kern
you could kern
they could kern 	I could be kerning
you could be kerning
she could be kerning
we could be kerning
you could be kerning
they could be kerning	I could have kerned
you could have kerned
she could have kerned
we could have kerned
you could have kerned
they could have kerned	I could have been kerning
you could have been kerning
she could have been kerning
we could have been kerning
you could have been kerning
they could have been kerning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't kern
you couldn't kern
she couldn't kern
we couldn't kern
you couldn't kern
they couldn't kern 	I couldn't be kerning
you couldn't be kerning
she couldn't be kerning
we couldn't be kerning
you couldn't be kerning
they couldn't be kerning	I couldn't have kerned
you couldn't have kerned
she couldn't have kerned
we couldn't have kerned
you couldn't have kerned
they couldn't have kerned	I couldn't have been kerning
you couldn't have been kerning
she couldn't have been kerning
we couldn't have been kerning
you couldn't have been kerning
they couldn't have been kerning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I kern?
could you kern?
could she kern?
could we kern?
could you kern?
could they kern? 	could I be kerning?
could you be kerning?
could she be kerning?
could we be kerning?
could you be kerning?
could they be kerning? 	could I have kerned?
could you have kerned?
could she have kerned?
could we have kerned?
could you have kerned?
could they have kerned? 	could I have been kerning?
could you have been kerning?
could she have been kerning?
could we have been kerning?
could you have been kerning?
could they have been kerning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I kern?
couldn't you kern?
couldn't she kern?
couldn't we kern?
couldn't you kern?
couldn't they kern? 	couldn't I be kerning?
couldn't you be kerning?
couldn't she be kerning?
couldn't we be kerning?
couldn't you be kerning?
couldn't they be kerning? 	couldn't I have kerned?
couldn't you have kerned?
couldn't she have kerned?
couldn't we have kerned?
couldn't you have kerned?
couldn't they have kerned? 	couldn't I have been kerning?
couldn't you have been kerning?
couldn't she have been kerning?
couldn't we have been kerning?
couldn't you have been kerning?
couldn't they have been kerning?