could titrate
Regular verb: titrate - titrated- titrated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could titrate
you could titrate
he could titrate
we could titrate
you could titrate
they could titrate 	I could be titrating
you could be titrating
he could be titrating
we could be titrating
you could be titrating
they could be titrating	I could have titrated
you could have titrated
he could have titrated
we could have titrated
you could have titrated
they could have titrated	I could have been titrating
you could have been titrating
he could have been titrating
we could have been titrating
you could have been titrating
they could have been titrating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't titrate
you couldn't titrate
he couldn't titrate
we couldn't titrate
you couldn't titrate
they couldn't titrate 	I couldn't be titrating
you couldn't be titrating
he couldn't be titrating
we couldn't be titrating
you couldn't be titrating
they couldn't be titrating	I couldn't have titrated
you couldn't have titrated
he couldn't have titrated
we couldn't have titrated
you couldn't have titrated
they couldn't have titrated	I couldn't have been titrating
you couldn't have been titrating
he couldn't have been titrating
we couldn't have been titrating
you couldn't have been titrating
they couldn't have been titrating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I titrate?
could you titrate?
could he titrate?
could we titrate?
could you titrate?
could they titrate? 	could I be titrating?
could you be titrating?
could he be titrating?
could we be titrating?
could you be titrating?
could they be titrating? 	could I have titrated?
could you have titrated?
could he have titrated?
could we have titrated?
could you have titrated?
could they have titrated? 	could I have been titrating?
could you have been titrating?
could he have been titrating?
could we have been titrating?
could you have been titrating?
could they have been titrating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I titrate?
couldn't you titrate?
couldn't he titrate?
couldn't we titrate?
couldn't you titrate?
couldn't they titrate? 	couldn't I be titrating?
couldn't you be titrating?
couldn't he be titrating?
couldn't we be titrating?
couldn't you be titrating?
couldn't they be titrating? 	couldn't I have titrated?
couldn't you have titrated?
couldn't he have titrated?
couldn't we have titrated?
couldn't you have titrated?
couldn't they have titrated? 	couldn't I have been titrating?
couldn't you have been titrating?
couldn't he have been titrating?
couldn't we have been titrating?
couldn't you have been titrating?
couldn't they have been titrating?