could castrate
Regular verb: castrate - castrated- castrated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could castrate
you could castrate
he could castrate
we could castrate
you could castrate
they could castrate 	I could be castrating
you could be castrating
he could be castrating
we could be castrating
you could be castrating
they could be castrating	I could have castrated
you could have castrated
he could have castrated
we could have castrated
you could have castrated
they could have castrated	I could have been castrating
you could have been castrating
he could have been castrating
we could have been castrating
you could have been castrating
they could have been castrating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't castrate
you couldn't castrate
he couldn't castrate
we couldn't castrate
you couldn't castrate
they couldn't castrate 	I couldn't be castrating
you couldn't be castrating
he couldn't be castrating
we couldn't be castrating
you couldn't be castrating
they couldn't be castrating	I couldn't have castrated
you couldn't have castrated
he couldn't have castrated
we couldn't have castrated
you couldn't have castrated
they couldn't have castrated	I couldn't have been castrating
you couldn't have been castrating
he couldn't have been castrating
we couldn't have been castrating
you couldn't have been castrating
they couldn't have been castrating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I castrate?
could you castrate?
could he castrate?
could we castrate?
could you castrate?
could they castrate? 	could I be castrating?
could you be castrating?
could he be castrating?
could we be castrating?
could you be castrating?
could they be castrating? 	could I have castrated?
could you have castrated?
could he have castrated?
could we have castrated?
could you have castrated?
could they have castrated? 	could I have been castrating?
could you have been castrating?
could he have been castrating?
could we have been castrating?
could you have been castrating?
could they have been castrating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I castrate?
couldn't you castrate?
couldn't he castrate?
couldn't we castrate?
couldn't you castrate?
couldn't they castrate? 	couldn't I be castrating?
couldn't you be castrating?
couldn't he be castrating?
couldn't we be castrating?
couldn't you be castrating?
couldn't they be castrating? 	couldn't I have castrated?
couldn't you have castrated?
couldn't he have castrated?
couldn't we have castrated?
couldn't you have castrated?
couldn't they have castrated? 	couldn't I have been castrating?
couldn't you have been castrating?
couldn't he have been castrating?
couldn't we have been castrating?
couldn't you have been castrating?
couldn't they have been castrating?