I can winterkill you can winterkill he can winterkill we can winterkill you can winterkill they can winterkill
V-ing form
I can be winterkilling you can be winterkilling he can be winterkilling we can be winterkilling you can be winterkilling they can be winterkilling
Perfect
I can have winterkilled you can have winterkilled he can have winterkilled we can have winterkilled you can have winterkilled they can have winterkilled
V-ing perfect
I can have been winterkilling you can have been winterkilling he can have been winterkilling we can have been winterkilling you can have been winterkilling they can have been winterkilling
Negation
Simple form
I cannot winterkill you cannot winterkill he cannot winterkill we cannot winterkill you cannot winterkill they cannot winterkill
V-ing form
I cannot be winterkilling you cannot be winterkilling he cannot be winterkilling we cannot be winterkilling you cannot be winterkilling they cannot be winterkilling
Perfect
I cannot have winterkilled you cannot have winterkilled he cannot have winterkilled we cannot have winterkilled you cannot have winterkilled they cannot have winterkilled
V-ing perfect
I cannot have been winterkilling you cannot have been winterkilling he cannot have been winterkilling we cannot have been winterkilling you cannot have been winterkilling they cannot have been winterkilling
Interrogative form
Simple form
can I winterkill? can you winterkill? can he winterkill? can we winterkill? can you winterkill? can they winterkill?
V-ing form
can I be winterkilling? can you be winterkilling? can he be winterkilling? can we be winterkilling? can you be winterkilling? can they be winterkilling?
Perfect
can I have winterkilled? can you have winterkilled? can he have winterkilled? can we have winterkilled? can you have winterkilled? can they have winterkilled?
V-ing perfect
can I have been winterkilling? can you have been winterkilling? can he have been winterkilling? can we have been winterkilling? can you have been winterkilling? can they have been winterkilling?
Interro-negative form
Simple form
can I not winterkill? can you not winterkill? can he not winterkill? can we not winterkill? can you not winterkill? can they not winterkill?
V-ing form
can I not be winterkilling? can you not be winterkilling? can he not be winterkilling? can we not be winterkilling? can you not be winterkilling? can they not be winterkilling?
Perfect
can I not have winterkilled? can you not have winterkilled? can he not have winterkilled? can we not have winterkilled? can you not have winterkilled? can they not have winterkilled?
V-ing perfect
can I not have been winterkilling? can you not have been winterkilling? can he not have been winterkilling? can we not have been winterkilling? can you not have been winterkilling? can they not have been winterkilling?