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 couldn't untangle you couldn't untangle he couldn't untangle we couldn't untangle you couldn't untangle they couldn't untangle	I couldn't be untangling you couldn't be untangling he couldn't be untangling we couldn't be untangling you couldn't be untangling they couldn't be untangling
Perfect	V-ing perfect
I couldn't have untangled you couldn't have untangled he couldn't have untangled we couldn't have untangled you couldn't have untangled they couldn't have untangled	I couldn't have been untangling you couldn't have been untangling he couldn't have been untangling we couldn't have been untangling you couldn't have been untangling they couldn't 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
couldn't I untangle? couldn't you untangle? couldn't he untangle? couldn't we untangle? couldn't you untangle? couldn't they untangle?	couldn't I be untangling? couldn't you be untangling? couldn't he be untangling? couldn't we be untangling? couldn't you be untangling? couldn't they be untangling?
Perfect	V-ing perfect
couldn't I have untangled? couldn't you have untangled? couldn't he have untangled? couldn't we have untangled? couldn't you have untangled? couldn't they have untangled?	couldn't I have been untangling? couldn't you have been untangling? couldn't he have been untangling? couldn't we have been untangling? couldn't you have been untangling? couldn't they have been untangling?