I could threat you could threat she could threat we could threat you could threat they could threat
V-ing form
I could be threating you could be threating she could be threating we could be threating you could be threating they could be threating
Perfect
I could have threated you could have threated she could have threated we could have threated you could have threated they could have threated
V-ing perfect
I could have been threating you could have been threating she could have been threating we could have been threating you could have been threating they could have been threating
Negation
Simple form
I could not threat you could not threat she could not threat we could not threat you could not threat they could not threat
V-ing form
I could not be threating you could not be threating she could not be threating we could not be threating you could not be threating they could not be threating
Perfect
I could not have threated you could not have threated she could not have threated we could not have threated you could not have threated they could not have threated
V-ing perfect
I could not have been threating you could not have been threating she could not have been threating we could not have been threating you could not have been threating they could not have been threating
Interrogative form
Simple form
could I threat? could you threat? could she threat? could we threat? could you threat? could they threat?
V-ing form
could I be threating? could you be threating? could she be threating? could we be threating? could you be threating? could they be threating?
Perfect
could I have threated? could you have threated? could she have threated? could we have threated? could you have threated? could they have threated?
V-ing perfect
could I have been threating? could you have been threating? could she have been threating? could we have been threating? could you have been threating? could they have been threating?
Interro-negative form
Simple form
could I not threat? could you not threat? could she not threat? could we not threat? could you not threat? could they not threat?
V-ing form
could I not be threating? could you not be threating? could she not be threating? could we not be threating? could you not be threating? could they not be threating?
Perfect
could I not have threated? could you not have threated? could she not have threated? could we not have threated? could you not have threated? could they not have threated?
V-ing perfect
could I not have been threating? could you not have been threating? could she not have been threating? could we not have been threating? could you not have been threating? could they not have been threating?