could prescribe
Regular verb: prescribe - prescribed- prescribed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could prescribe
you could prescribe
she could prescribe
we could prescribe
you could prescribe
they could prescribe 	I could be prescribing
you could be prescribing
she could be prescribing
we could be prescribing
you could be prescribing
they could be prescribing	I could have prescribed
you could have prescribed
she could have prescribed
we could have prescribed
you could have prescribed
they could have prescribed	I could have been prescribing
you could have been prescribing
she could have been prescribing
we could have been prescribing
you could have been prescribing
they could have been prescribing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't prescribe
you couldn't prescribe
she couldn't prescribe
we couldn't prescribe
you couldn't prescribe
they couldn't prescribe 	I couldn't be prescribing
you couldn't be prescribing
she couldn't be prescribing
we couldn't be prescribing
you couldn't be prescribing
they couldn't be prescribing	I couldn't have prescribed
you couldn't have prescribed
she couldn't have prescribed
we couldn't have prescribed
you couldn't have prescribed
they couldn't have prescribed	I couldn't have been prescribing
you couldn't have been prescribing
she couldn't have been prescribing
we couldn't have been prescribing
you couldn't have been prescribing
they couldn't have been prescribing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I prescribe?
could you prescribe?
could she prescribe?
could we prescribe?
could you prescribe?
could they prescribe? 	could I be prescribing?
could you be prescribing?
could she be prescribing?
could we be prescribing?
could you be prescribing?
could they be prescribing? 	could I have prescribed?
could you have prescribed?
could she have prescribed?
could we have prescribed?
could you have prescribed?
could they have prescribed? 	could I have been prescribing?
could you have been prescribing?
could she have been prescribing?
could we have been prescribing?
could you have been prescribing?
could they have been prescribing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I prescribe?
couldn't you prescribe?
couldn't she prescribe?
couldn't we prescribe?
couldn't you prescribe?
couldn't they prescribe? 	couldn't I be prescribing?
couldn't you be prescribing?
couldn't she be prescribing?
couldn't we be prescribing?
couldn't you be prescribing?
couldn't they be prescribing? 	couldn't I have prescribed?
couldn't you have prescribed?
couldn't she have prescribed?
couldn't we have prescribed?
couldn't you have prescribed?
couldn't they have prescribed? 	couldn't I have been prescribing?
couldn't you have been prescribing?
couldn't she have been prescribing?
couldn't we have been prescribing?
couldn't you have been prescribing?
couldn't they have been prescribing?