could deuterate
Regular verb: deuterate - deuterated- deuterated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could deuterate
you could deuterate
he could deuterate
we could deuterate
you could deuterate
they could deuterate 	I could be deuterating
you could be deuterating
he could be deuterating
we could be deuterating
you could be deuterating
they could be deuterating	I could have deuterated
you could have deuterated
he could have deuterated
we could have deuterated
you could have deuterated
they could have deuterated	I could have been deuterating
you could have been deuterating
he could have been deuterating
we could have been deuterating
you could have been deuterating
they could have been deuterating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not deuterate
you could not deuterate
he could not deuterate
we could not deuterate
you could not deuterate
they could not deuterate 	I could not be deuterating
you could not be deuterating
he could not be deuterating
we could not be deuterating
you could not be deuterating
they could not be deuterating	I could not have deuterated
you could not have deuterated
he could not have deuterated
we could not have deuterated
you could not have deuterated
they could not have deuterated	I could not have been deuterating
you could not have been deuterating
he could not have been deuterating
we could not have been deuterating
you could not have been deuterating
they could not have been deuterating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I deuterate?
could you deuterate?
could he deuterate?
could we deuterate?
could you deuterate?
could they deuterate? 	could I be deuterating?
could you be deuterating?
could he be deuterating?
could we be deuterating?
could you be deuterating?
could they be deuterating? 	could I have deuterated?
could you have deuterated?
could he have deuterated?
could we have deuterated?
could you have deuterated?
could they have deuterated? 	could I have been deuterating?
could you have been deuterating?
could he have been deuterating?
could we have been deuterating?
could you have been deuterating?
could they have been deuterating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not deuterate?
could you not deuterate?
could he not deuterate?
could we not deuterate?
could you not deuterate?
could they not deuterate? 	could I not be deuterating?
could you not be deuterating?
could he not be deuterating?
could we not be deuterating?
could you not be deuterating?
could they not be deuterating? 	could I not have deuterated?
could you not have deuterated?
could he not have deuterated?
could we not have deuterated?
could you not have deuterated?
could they not have deuterated? 	could I not have been deuterating?
could you not have been deuterating?
could he not have been deuterating?
could we not have been deuterating?
could you not have been deuterating?
could they not have been deuterating?