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