could mercurate
Regular verb: mercurate - mercurated- mercurated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could mercurate
you could mercurate
he could mercurate
we could mercurate
you could mercurate
they could mercurate 	I could be mercurating
you could be mercurating
he could be mercurating
we could be mercurating
you could be mercurating
they could be mercurating	I could have mercurated
you could have mercurated
he could have mercurated
we could have mercurated
you could have mercurated
they could have mercurated	I could have been mercurating
you could have been mercurating
he could have been mercurating
we could have been mercurating
you could have been mercurating
they could have been mercurating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't mercurate
you couldn't mercurate
he couldn't mercurate
we couldn't mercurate
you couldn't mercurate
they couldn't mercurate 	I couldn't be mercurating
you couldn't be mercurating
he couldn't be mercurating
we couldn't be mercurating
you couldn't be mercurating
they couldn't be mercurating	I couldn't have mercurated
you couldn't have mercurated
he couldn't have mercurated
we couldn't have mercurated
you couldn't have mercurated
they couldn't have mercurated	I couldn't have been mercurating
you couldn't have been mercurating
he couldn't have been mercurating
we couldn't have been mercurating
you couldn't have been mercurating
they couldn't have been mercurating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I mercurate?
could you mercurate?
could he mercurate?
could we mercurate?
could you mercurate?
could they mercurate? 	could I be mercurating?
could you be mercurating?
could he be mercurating?
could we be mercurating?
could you be mercurating?
could they be mercurating? 	could I have mercurated?
could you have mercurated?
could he have mercurated?
could we have mercurated?
could you have mercurated?
could they have mercurated? 	could I have been mercurating?
could you have been mercurating?
could he have been mercurating?
could we have been mercurating?
could you have been mercurating?
could they have been mercurating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I mercurate?
couldn't you mercurate?
couldn't he mercurate?
couldn't we mercurate?
couldn't you mercurate?
couldn't they mercurate? 	couldn't I be mercurating?
couldn't you be mercurating?
couldn't he be mercurating?
couldn't we be mercurating?
couldn't you be mercurating?
couldn't they be mercurating? 	couldn't I have mercurated?
couldn't you have mercurated?
couldn't he have mercurated?
couldn't we have mercurated?
couldn't you have mercurated?
couldn't they have mercurated? 	couldn't I have been mercurating?
couldn't you have been mercurating?
couldn't he have been mercurating?
couldn't we have been mercurating?
couldn't you have been mercurating?
couldn't they have been mercurating?