English verb conjugation
COULD BACKFLIP

Regular verb: backflip - backfliped - backfliped

Affirmation

Simple form	V-ing form
I could backflip you could backflip he could backflip we could backflip you could backflip they could backflip	I could be backfliping you could be backfliping he could be backfliping we could be backfliping you could be backfliping they could be backfliping
Perfect	V-ing perfect
I could have backfliped you could have backfliped he could have backfliped we could have backfliped you could have backfliped they could have backfliped	I could have been backfliping you could have been backfliping he could have been backfliping we could have been backfliping you could have been backfliping they could have been backfliping

Negation

Simple form	V-ing form
I couldn't backflip you couldn't backflip he couldn't backflip we couldn't backflip you couldn't backflip they couldn't backflip	I couldn't be backfliping you couldn't be backfliping he couldn't be backfliping we couldn't be backfliping you couldn't be backfliping they couldn't be backfliping
Perfect	V-ing perfect
I couldn't have backfliped you couldn't have backfliped he couldn't have backfliped we couldn't have backfliped you couldn't have backfliped they couldn't have backfliped	I couldn't have been backfliping you couldn't have been backfliping he couldn't have been backfliping we couldn't have been backfliping you couldn't have been backfliping they couldn't have been backfliping

Interrogative form

Simple form	V-ing form
could I backflip? could you backflip? could he backflip? could we backflip? could you backflip? could they backflip?	could I be backfliping? could you be backfliping? could he be backfliping? could we be backfliping? could you be backfliping? could they be backfliping?
Perfect	V-ing perfect
could I have backfliped? could you have backfliped? could he have backfliped? could we have backfliped? could you have backfliped? could they have backfliped?	could I have been backfliping? could you have been backfliping? could he have been backfliping? could we have been backfliping? could you have been backfliping? could they have been backfliping?

Interro-negative form

Simple form	V-ing form
couldn't I backflip? couldn't you backflip? couldn't he backflip? couldn't we backflip? couldn't you backflip? couldn't they backflip?	couldn't I be backfliping? couldn't you be backfliping? couldn't he be backfliping? couldn't we be backfliping? couldn't you be backfliping? couldn't they be backfliping?
Perfect	V-ing perfect
couldn't I have backfliped? couldn't you have backfliped? couldn't he have backfliped? couldn't we have backfliped? couldn't you have backfliped? couldn't they have backfliped?	couldn't I have been backfliping? couldn't you have been backfliping? couldn't he have been backfliping? couldn't we have been backfliping? couldn't you have been backfliping? couldn't they have been backfliping?