could guillotine
Regular verb: guillotine - guillotined- guillotined

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could guillotine
you could guillotine
he could guillotine
we could guillotine
you could guillotine
they could guillotine 	I could be guillotining
you could be guillotining
he could be guillotining
we could be guillotining
you could be guillotining
they could be guillotining	I could have guillotined
you could have guillotined
he could have guillotined
we could have guillotined
you could have guillotined
they could have guillotined	I could have been guillotining
you could have been guillotining
he could have been guillotining
we could have been guillotining
you could have been guillotining
they could have been guillotining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't guillotine
you couldn't guillotine
he couldn't guillotine
we couldn't guillotine
you couldn't guillotine
they couldn't guillotine 	I couldn't be guillotining
you couldn't be guillotining
he couldn't be guillotining
we couldn't be guillotining
you couldn't be guillotining
they couldn't be guillotining	I couldn't have guillotined
you couldn't have guillotined
he couldn't have guillotined
we couldn't have guillotined
you couldn't have guillotined
they couldn't have guillotined	I couldn't have been guillotining
you couldn't have been guillotining
he couldn't have been guillotining
we couldn't have been guillotining
you couldn't have been guillotining
they couldn't have been guillotining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I guillotine?
could you guillotine?
could he guillotine?
could we guillotine?
could you guillotine?
could they guillotine? 	could I be guillotining?
could you be guillotining?
could he be guillotining?
could we be guillotining?
could you be guillotining?
could they be guillotining? 	could I have guillotined?
could you have guillotined?
could he have guillotined?
could we have guillotined?
could you have guillotined?
could they have guillotined? 	could I have been guillotining?
could you have been guillotining?
could he have been guillotining?
could we have been guillotining?
could you have been guillotining?
could they have been guillotining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I guillotine?
couldn't you guillotine?
couldn't he guillotine?
couldn't we guillotine?
couldn't you guillotine?
couldn't they guillotine? 	couldn't I be guillotining?
couldn't you be guillotining?
couldn't he be guillotining?
couldn't we be guillotining?
couldn't you be guillotining?
couldn't they be guillotining? 	couldn't I have guillotined?
couldn't you have guillotined?
couldn't he have guillotined?
couldn't we have guillotined?
couldn't you have guillotined?
couldn't they have guillotined? 	couldn't I have been guillotining?
couldn't you have been guillotining?
couldn't he have been guillotining?
couldn't we have been guillotining?
couldn't you have been guillotining?
couldn't they have been guillotining?