English verb conjugation
COULD FALSIFY

Regular verb: falsify - falsified - falsified

Affirmation

Simple form	V-ing form
I could falsify you could falsify she could falsify we could falsify you could falsify they could falsify	I could be falsifying you could be falsifying she could be falsifying we could be falsifying you could be falsifying they could be falsifying
Perfect	V-ing perfect
I could have falsified you could have falsified she could have falsified we could have falsified you could have falsified they could have falsified	I could have been falsifying you could have been falsifying she could have been falsifying we could have been falsifying you could have been falsifying they could have been falsifying

Negation

Simple form	V-ing form
I couldn't falsify you couldn't falsify she couldn't falsify we couldn't falsify you couldn't falsify they couldn't falsify	I couldn't be falsifying you couldn't be falsifying she couldn't be falsifying we couldn't be falsifying you couldn't be falsifying they couldn't be falsifying
Perfect	V-ing perfect
I couldn't have falsified you couldn't have falsified she couldn't have falsified we couldn't have falsified you couldn't have falsified they couldn't have falsified	I couldn't have been falsifying you couldn't have been falsifying she couldn't have been falsifying we couldn't have been falsifying you couldn't have been falsifying they couldn't have been falsifying

Interrogative form

Simple form	V-ing form
could I falsify? could you falsify? could she falsify? could we falsify? could you falsify? could they falsify?	could I be falsifying? could you be falsifying? could she be falsifying? could we be falsifying? could you be falsifying? could they be falsifying?
Perfect	V-ing perfect
could I have falsified? could you have falsified? could she have falsified? could we have falsified? could you have falsified? could they have falsified?	could I have been falsifying? could you have been falsifying? could she have been falsifying? could we have been falsifying? could you have been falsifying? could they have been falsifying?

Interro-negative form

Simple form	V-ing form
couldn't I falsify? couldn't you falsify? couldn't she falsify? couldn't we falsify? couldn't you falsify? couldn't they falsify?	couldn't I be falsifying? couldn't you be falsifying? couldn't she be falsifying? couldn't we be falsifying? couldn't you be falsifying? couldn't they be falsifying?
Perfect	V-ing perfect
couldn't I have falsified? couldn't you have falsified? couldn't she have falsified? couldn't we have falsified? couldn't you have falsified? couldn't they have falsified?	couldn't I have been falsifying? couldn't you have been falsifying? couldn't she have been falsifying? couldn't we have been falsifying? couldn't you have been falsifying? couldn't they have been falsifying?