could filtrate
Regular verb: filtrate - filtrated- filtrated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could filtrate
you could filtrate
she could filtrate
we could filtrate
you could filtrate
they could filtrate 	I could be filtrating
you could be filtrating
she could be filtrating
we could be filtrating
you could be filtrating
they could be filtrating	I could have filtrated
you could have filtrated
she could have filtrated
we could have filtrated
you could have filtrated
they could have filtrated	I could have been filtrating
you could have been filtrating
she could have been filtrating
we could have been filtrating
you could have been filtrating
they could have been filtrating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not filtrate
you could not filtrate
she could not filtrate
we could not filtrate
you could not filtrate
they could not filtrate 	I could not be filtrating
you could not be filtrating
she could not be filtrating
we could not be filtrating
you could not be filtrating
they could not be filtrating	I could not have filtrated
you could not have filtrated
she could not have filtrated
we could not have filtrated
you could not have filtrated
they could not have filtrated	I could not have been filtrating
you could not have been filtrating
she could not have been filtrating
we could not have been filtrating
you could not have been filtrating
they could not have been filtrating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I filtrate?
could you filtrate?
could she filtrate?
could we filtrate?
could you filtrate?
could they filtrate? 	could I be filtrating?
could you be filtrating?
could she be filtrating?
could we be filtrating?
could you be filtrating?
could they be filtrating? 	could I have filtrated?
could you have filtrated?
could she have filtrated?
could we have filtrated?
could you have filtrated?
could they have filtrated? 	could I have been filtrating?
could you have been filtrating?
could she have been filtrating?
could we have been filtrating?
could you have been filtrating?
could they have been filtrating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not filtrate?
could you not filtrate?
could she not filtrate?
could we not filtrate?
could you not filtrate?
could they not filtrate? 	could I not be filtrating?
could you not be filtrating?
could she not be filtrating?
could we not be filtrating?
could you not be filtrating?
could they not be filtrating? 	could I not have filtrated?
could you not have filtrated?
could she not have filtrated?
could we not have filtrated?
could you not have filtrated?
could they not have filtrated? 	could I not have been filtrating?
could you not have been filtrating?
could she not have been filtrating?
could we not have been filtrating?
could you not have been filtrating?
could they not have been filtrating?