could supervise
Regular verb: supervise - supervised- supervised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could supervise
you could supervise
he could supervise
we could supervise
you could supervise
they could supervise 	I could be supervising
you could be supervising
he could be supervising
we could be supervising
you could be supervising
they could be supervising	I could have supervised
you could have supervised
he could have supervised
we could have supervised
you could have supervised
they could have supervised	I could have been supervising
you could have been supervising
he could have been supervising
we could have been supervising
you could have been supervising
they could have been supervising	

Negation 	
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I couldn't supervise
you couldn't supervise
he couldn't supervise
we couldn't supervise
you couldn't supervise
they couldn't supervise 	I couldn't be supervising
you couldn't be supervising
he couldn't be supervising
we couldn't be supervising
you couldn't be supervising
they couldn't be supervising	I couldn't have supervised
you couldn't have supervised
he couldn't have supervised
we couldn't have supervised
you couldn't have supervised
they couldn't have supervised	I couldn't have been supervising
you couldn't have been supervising
he couldn't have been supervising
we couldn't have been supervising
you couldn't have been supervising
they couldn't have been supervising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I supervise?
could you supervise?
could he supervise?
could we supervise?
could you supervise?
could they supervise? 	could I be supervising?
could you be supervising?
could he be supervising?
could we be supervising?
could you be supervising?
could they be supervising? 	could I have supervised?
could you have supervised?
could he have supervised?
could we have supervised?
could you have supervised?
could they have supervised? 	could I have been supervising?
could you have been supervising?
could he have been supervising?
could we have been supervising?
could you have been supervising?
could they have been supervising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I supervise?
couldn't you supervise?
couldn't he supervise?
couldn't we supervise?
couldn't you supervise?
couldn't they supervise? 	couldn't I be supervising?
couldn't you be supervising?
couldn't he be supervising?
couldn't we be supervising?
couldn't you be supervising?
couldn't they be supervising? 	couldn't I have supervised?
couldn't you have supervised?
couldn't he have supervised?
couldn't we have supervised?
couldn't you have supervised?
couldn't they have supervised? 	couldn't I have been supervising?
couldn't you have been supervising?
couldn't he have been supervising?
couldn't we have been supervising?
couldn't you have been supervising?
couldn't they have been supervising?