English verb conjugation
COULD CAUSE

Regular verb: cause - caused - caused

Affirmation

Simple form	V-ing form
I could cause you could cause she could cause we could cause you could cause they could cause	I could be causing you could be causing she could be causing we could be causing you could be causing they could be causing
Perfect	V-ing perfect
I could have caused you could have caused she could have caused we could have caused you could have caused they could have caused	I could have been causing you could have been causing she could have been causing we could have been causing you could have been causing they could have been causing

Negation

Simple form	V-ing form
I couldn't cause you couldn't cause she couldn't cause we couldn't cause you couldn't cause they couldn't cause	I couldn't be causing you couldn't be causing she couldn't be causing we couldn't be causing you couldn't be causing they couldn't be causing
Perfect	V-ing perfect
I couldn't have caused you couldn't have caused she couldn't have caused we couldn't have caused you couldn't have caused they couldn't have caused	I couldn't have been causing you couldn't have been causing she couldn't have been causing we couldn't have been causing you couldn't have been causing they couldn't have been causing

Interrogative form

Simple form	V-ing form
could I cause? could you cause? could she cause? could we cause? could you cause? could they cause?	could I be causing? could you be causing? could she be causing? could we be causing? could you be causing? could they be causing?
Perfect	V-ing perfect
could I have caused? could you have caused? could she have caused? could we have caused? could you have caused? could they have caused?	could I have been causing? could you have been causing? could she have been causing? could we have been causing? could you have been causing? could they have been causing?

Interro-negative form

Simple form	V-ing form
couldn't I cause? couldn't you cause? couldn't she cause? couldn't we cause? couldn't you cause? couldn't they cause?	couldn't I be causing? couldn't you be causing? couldn't she be causing? couldn't we be causing? couldn't you be causing? couldn't they be causing?
Perfect	V-ing perfect
couldn't I have caused? couldn't you have caused? couldn't she have caused? couldn't we have caused? couldn't you have caused? couldn't they have caused?	couldn't I have been causing? couldn't you have been causing? couldn't she have been causing? couldn't we have been causing? couldn't you have been causing? couldn't they have been causing?