English verb conjugation
COULD WINTERKILL

Regular verb: winterkill - winterkilled - winterkilled

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?