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 couldn't threat you couldn't threat she couldn't threat we couldn't threat you couldn't threat they couldn't threat
V-ing form
I couldn't be threating you couldn't be threating she couldn't be threating we couldn't be threating you couldn't be threating they couldn't be threating
Perfect
I couldn't have threated you couldn't have threated she couldn't have threated we couldn't have threated you couldn't have threated they couldn't have threated
V-ing perfect
I couldn't have been threating you couldn't have been threating she couldn't have been threating we couldn't have been threating you couldn't have been threating they couldn't 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
couldn't I threat? couldn't you threat? couldn't she threat? couldn't we threat? couldn't you threat? couldn't they threat?
V-ing form
couldn't I be threating? couldn't you be threating? couldn't she be threating? couldn't we be threating? couldn't you be threating? couldn't they be threating?
Perfect
couldn't I have threated? couldn't you have threated? couldn't she have threated? couldn't we have threated? couldn't you have threated? couldn't they have threated?
V-ing perfect
couldn't I have been threating? couldn't you have been threating? couldn't she have been threating? couldn't we have been threating? couldn't you have been threating? couldn't they have been threating?