English verb conjugation
COULD BACKFLIP

Regular verb: backflip - backfliped - backfliped

Affirmation

Simple form	V-ing form
I could backflip you could backflip she could backflip we could backflip you could backflip they could backflip	I could be backfliping you could be backfliping she 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 she 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 she 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 she 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 she 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 she 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 she 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 she backflip? could we backflip? could you backflip? could they backflip?	could I be backfliping? could you be backfliping? could she 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 she 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 she 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 she 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 she 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 she 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 she have been backfliping? couldn't we have been backfliping? couldn't you have been backfliping? couldn't they have been backfliping?