English verb conjugation
COULD UNTANGLE

Regular verb: untangle - untangled - untangled

Affirmation

Simple form	V-ing form
I could untangle you could untangle he could untangle we could untangle you could untangle they could untangle	I could be untangling you could be untangling he could be untangling we could be untangling you could be untangling they could be untangling
Perfect	V-ing perfect
I could have untangled you could have untangled he could have untangled we could have untangled you could have untangled they could have untangled	I could have been untangling you could have been untangling he could have been untangling we could have been untangling you could have been untangling they could have been untangling

Negation

Simple form	V-ing form
I could not untangle you could not untangle he could not untangle we could not untangle you could not untangle they could not untangle	I could not be untangling you could not be untangling he could not be untangling we could not be untangling you could not be untangling they could not be untangling
Perfect	V-ing perfect
I could not have untangled you could not have untangled he could not have untangled we could not have untangled you could not have untangled they could not have untangled	I could not have been untangling you could not have been untangling he could not have been untangling we could not have been untangling you could not have been untangling they could not have been untangling

Interrogative form

Simple form	V-ing form
could I untangle? could you untangle? could he untangle? could we untangle? could you untangle? could they untangle?	could I be untangling? could you be untangling? could he be untangling? could we be untangling? could you be untangling? could they be untangling?
Perfect	V-ing perfect
could I have untangled? could you have untangled? could he have untangled? could we have untangled? could you have untangled? could they have untangled?	could I have been untangling? could you have been untangling? could he have been untangling? could we have been untangling? could you have been untangling? could they have been untangling?

Interro-negative form

Simple form	V-ing form
could I not untangle? could you not untangle? could he not untangle? could we not untangle? could you not untangle? could they not untangle?	could I not be untangling? could you not be untangling? could he not be untangling? could we not be untangling? could you not be untangling? could they not be untangling?
Perfect	V-ing perfect
could I not have untangled? could you not have untangled? could he not have untangled? could we not have untangled? could you not have untangled? could they not have untangled?	could I not have been untangling? could you not have been untangling? could he not have been untangling? could we not have been untangling? could you not have been untangling? could they not have been untangling?