can falsify
Regular verb: falsify - falsified- falsified

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can falsify
you can falsify
he can falsify
we can falsify
you can falsify
they can falsify 	I can be falsifying
you can be falsifying
he can be falsifying
we can be falsifying
you can be falsifying
they can be falsifying	I can have falsified
you can have falsified
he can have falsified
we can have falsified
you can have falsified
they can have falsified	I can have been falsifying
you can have been falsifying
he can have been falsifying
we can have been falsifying
you can have been falsifying
they can have been falsifying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't falsify
you can't falsify
he can't falsify
we can't falsify
you can't falsify
they can't falsify 	I can't be falsifying
you can't be falsifying
he can't be falsifying
we can't be falsifying
you can't be falsifying
they can't be falsifying	I can't have falsified
you can't have falsified
he can't have falsified
we can't have falsified
you can't have falsified
they can't have falsified	I can't have been falsifying
you can't have been falsifying
he can't have been falsifying
we can't have been falsifying
you can't have been falsifying
they can't have been falsifying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I falsify?
can you falsify?
can he falsify?
can we falsify?
can you falsify?
can they falsify? 	can I be falsifying?
can you be falsifying?
can he be falsifying?
can we be falsifying?
can you be falsifying?
can they be falsifying? 	can I have falsified?
can you have falsified?
can he have falsified?
can we have falsified?
can you have falsified?
can they have falsified? 	can I have been falsifying?
can you have been falsifying?
can he have been falsifying?
can we have been falsifying?
can you have been falsifying?
can they have been falsifying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I falsify?
can't you falsify?
can't he falsify?
can't we falsify?
can't you falsify?
can't they falsify? 	can't I be falsifying?
can't you be falsifying?
can't he be falsifying?
can't we be falsifying?
can't you be falsifying?
can't they be falsifying? 	can't I have falsified?
can't you have falsified?
can't he have falsified?
can't we have falsified?
can't you have falsified?
can't they have falsified? 	can't I have been falsifying?
can't you have been falsifying?
can't he have been falsifying?
can't we have been falsifying?
can't you have been falsifying?
can't they have been falsifying?