English verb conjugation
COULD UNSTOP

Regular verb: unstop - unstopped - unstopped

Affirmation

Simple form	V-ing form
I could unstop you could unstop she could unstop we could unstop you could unstop they could unstop	I could be unstopping you could be unstopping she could be unstopping we could be unstopping you could be unstopping they could be unstopping
Perfect	V-ing perfect
I could have unstopped you could have unstopped she could have unstopped we could have unstopped you could have unstopped they could have unstopped	I could have been unstopping you could have been unstopping she could have been unstopping we could have been unstopping you could have been unstopping they could have been unstopping

Negation

Simple form	V-ing form
I could not unstop you could not unstop she could not unstop we could not unstop you could not unstop they could not unstop	I could not be unstopping you could not be unstopping she could not be unstopping we could not be unstopping you could not be unstopping they could not be unstopping
Perfect	V-ing perfect
I could not have unstopped you could not have unstopped she could not have unstopped we could not have unstopped you could not have unstopped they could not have unstopped	I could not have been unstopping you could not have been unstopping she could not have been unstopping we could not have been unstopping you could not have been unstopping they could not have been unstopping

Interrogative form

Simple form	V-ing form
could I unstop? could you unstop? could she unstop? could we unstop? could you unstop? could they unstop?	could I be unstopping? could you be unstopping? could she be unstopping? could we be unstopping? could you be unstopping? could they be unstopping?
Perfect	V-ing perfect
could I have unstopped? could you have unstopped? could she have unstopped? could we have unstopped? could you have unstopped? could they have unstopped?	could I have been unstopping? could you have been unstopping? could she have been unstopping? could we have been unstopping? could you have been unstopping? could they have been unstopping?

Interro-negative form

Simple form	V-ing form
could I not unstop? could you not unstop? could she not unstop? could we not unstop? could you not unstop? could they not unstop?	could I not be unstopping? could you not be unstopping? could she not be unstopping? could we not be unstopping? could you not be unstopping? could they not be unstopping?
Perfect	V-ing perfect
could I not have unstopped? could you not have unstopped? could she not have unstopped? could we not have unstopped? could you not have unstopped? could they not have unstopped?	could I not have been unstopping? could you not have been unstopping? could she not have been unstopping? could we not have been unstopping? could you not have been unstopping? could they not have been unstopping?