could winterkill
Regular verb: winterkill - winterkilled- winterkilled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could winterkill
you could winterkill
he could winterkill
we could winterkill
you could winterkill
they could winterkill 	I could be winterkilling
you could be winterkilling
he could be winterkilling
we could be winterkilling
you could be winterkilling
they could be winterkilling	I could have winterkilled
you could have winterkilled
he could have winterkilled
we could have winterkilled
you could have winterkilled
they could have winterkilled	I could have been winterkilling
you could have been winterkilling
he could have been winterkilling
we could have been winterkilling
you could have been winterkilling
they could have been winterkilling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't winterkill
you couldn't winterkill
he couldn't winterkill
we couldn't winterkill
you couldn't winterkill
they couldn't winterkill 	I couldn't be winterkilling
you couldn't be winterkilling
he couldn't be winterkilling
we couldn't be winterkilling
you couldn't be winterkilling
they couldn't be winterkilling	I couldn't have winterkilled
you couldn't have winterkilled
he couldn't have winterkilled
we couldn't have winterkilled
you couldn't have winterkilled
they couldn't have winterkilled	I couldn't have been winterkilling
you couldn't have been winterkilling
he couldn't have been winterkilling
we couldn't have been winterkilling
you couldn't have been winterkilling
they couldn't have been winterkilling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I winterkill?
could you winterkill?
could he winterkill?
could we winterkill?
could you winterkill?
could they winterkill? 	could I be winterkilling?
could you be winterkilling?
could he be winterkilling?
could we be winterkilling?
could you be winterkilling?
could they be winterkilling? 	could I have winterkilled?
could you have winterkilled?
could he have winterkilled?
could we have winterkilled?
could you have winterkilled?
could they have winterkilled? 	could I have been winterkilling?
could you have been winterkilling?
could he have been winterkilling?
could we have been winterkilling?
could you have been winterkilling?
could they have been winterkilling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I winterkill?
couldn't you winterkill?
couldn't he winterkill?
couldn't we winterkill?
couldn't you winterkill?
couldn't they winterkill? 	couldn't I be winterkilling?
couldn't you be winterkilling?
couldn't he be winterkilling?
couldn't we be winterkilling?
couldn't you be winterkilling?
couldn't they be winterkilling? 	couldn't I have winterkilled?
couldn't you have winterkilled?
couldn't he have winterkilled?
couldn't we have winterkilled?
couldn't you have winterkilled?
couldn't they have winterkilled? 	couldn't I have been winterkilling?
couldn't you have been winterkilling?
couldn't he have been winterkilling?
couldn't we have been winterkilling?
couldn't you have been winterkilling?
couldn't they have been winterkilling?