I could tangle you could tangle he could tangle we could tangle you could tangle they could tangle
V-ing form
I could be tangling you could be tangling he could be tangling we could be tangling you could be tangling they could be tangling
Perfect
I could have tangled you could have tangled he could have tangled we could have tangled you could have tangled they could have tangled
V-ing perfect
I could have been tangling you could have been tangling he could have been tangling we could have been tangling you could have been tangling they could have been tangling
Negation
Simple form
I couldn't tangle you couldn't tangle he couldn't tangle we couldn't tangle you couldn't tangle they couldn't tangle
V-ing form
I couldn't be tangling you couldn't be tangling he couldn't be tangling we couldn't be tangling you couldn't be tangling they couldn't be tangling
Perfect
I couldn't have tangled you couldn't have tangled he couldn't have tangled we couldn't have tangled you couldn't have tangled they couldn't have tangled
V-ing perfect
I couldn't have been tangling you couldn't have been tangling he couldn't have been tangling we couldn't have been tangling you couldn't have been tangling they couldn't have been tangling
Interrogative form
Simple form
could I tangle? could you tangle? could he tangle? could we tangle? could you tangle? could they tangle?
V-ing form
could I be tangling? could you be tangling? could he be tangling? could we be tangling? could you be tangling? could they be tangling?
Perfect
could I have tangled? could you have tangled? could he have tangled? could we have tangled? could you have tangled? could they have tangled?
V-ing perfect
could I have been tangling? could you have been tangling? could he have been tangling? could we have been tangling? could you have been tangling? could they have been tangling?
Interro-negative form
Simple form
couldn't I tangle? couldn't you tangle? couldn't he tangle? couldn't we tangle? couldn't you tangle? couldn't they tangle?
V-ing form
couldn't I be tangling? couldn't you be tangling? couldn't he be tangling? couldn't we be tangling? couldn't you be tangling? couldn't they be tangling?
Perfect
couldn't I have tangled? couldn't you have tangled? couldn't he have tangled? couldn't we have tangled? couldn't you have tangled? couldn't they have tangled?
V-ing perfect
couldn't I have been tangling? couldn't you have been tangling? couldn't he have been tangling? couldn't we have been tangling? couldn't you have been tangling? couldn't they have been tangling?