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 couldn't unstop you couldn't unstop she couldn't unstop we couldn't unstop you couldn't unstop they couldn't unstop	I couldn't be unstopping you couldn't be unstopping she couldn't be unstopping we couldn't be unstopping you couldn't be unstopping they couldn't be unstopping
Perfect	V-ing perfect
I couldn't have unstopped you couldn't have unstopped she couldn't have unstopped we couldn't have unstopped you couldn't have unstopped they couldn't have unstopped	I couldn't have been unstopping you couldn't have been unstopping she couldn't have been unstopping we couldn't have been unstopping you couldn't have been unstopping they couldn't 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
couldn't I unstop? couldn't you unstop? couldn't she unstop? couldn't we unstop? couldn't you unstop? couldn't they unstop?	couldn't I be unstopping? couldn't you be unstopping? couldn't she be unstopping? couldn't we be unstopping? couldn't you be unstopping? couldn't they be unstopping?
Perfect	V-ing perfect
couldn't I have unstopped? couldn't you have unstopped? couldn't she have unstopped? couldn't we have unstopped? couldn't you have unstopped? couldn't they have unstopped?	couldn't I have been unstopping? couldn't you have been unstopping? couldn't she have been unstopping? couldn't we have been unstopping? couldn't you have been unstopping? couldn't they have been unstopping?