can factor
Regular verb: factor - factored- factored

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can factor
you can factor
he can factor
we can factor
you can factor
they can factor 	I can be factoring
you can be factoring
he can be factoring
we can be factoring
you can be factoring
they can be factoring	I can have factored
you can have factored
he can have factored
we can have factored
you can have factored
they can have factored	I can have been factoring
you can have been factoring
he can have been factoring
we can have been factoring
you can have been factoring
they can have been factoring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot factor
you cannot factor
he cannot factor
we cannot factor
you cannot factor
they cannot factor 	I cannot be factoring
you cannot be factoring
he cannot be factoring
we cannot be factoring
you cannot be factoring
they cannot be factoring	I cannot have factored
you cannot have factored
he cannot have factored
we cannot have factored
you cannot have factored
they cannot have factored	I cannot have been factoring
you cannot have been factoring
he cannot have been factoring
we cannot have been factoring
you cannot have been factoring
they cannot have been factoring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I factor?
can you factor?
can he factor?
can we factor?
can you factor?
can they factor? 	can I be factoring?
can you be factoring?
can he be factoring?
can we be factoring?
can you be factoring?
can they be factoring? 	can I have factored?
can you have factored?
can he have factored?
can we have factored?
can you have factored?
can they have factored? 	can I have been factoring?
can you have been factoring?
can he have been factoring?
can we have been factoring?
can you have been factoring?
can they have been factoring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not factor?
can you not factor?
can he not factor?
can we not factor?
can you not factor?
can they not factor? 	can I not be factoring?
can you not be factoring?
can he not be factoring?
can we not be factoring?
can you not be factoring?
can they not be factoring? 	can I not have factored?
can you not have factored?
can he not have factored?
can we not have factored?
can you not have factored?
can they not have factored? 	can I not have been factoring?
can you not have been factoring?
can he not have been factoring?
can we not have been factoring?
can you not have been factoring?
can they not have been factoring?