could instruct
Regular verb: instruct - instructed- instructed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could instruct
you could instruct
he could instruct
we could instruct
you could instruct
they could instruct 	I could be instructing
you could be instructing
he could be instructing
we could be instructing
you could be instructing
they could be instructing	I could have instructed
you could have instructed
he could have instructed
we could have instructed
you could have instructed
they could have instructed	I could have been instructing
you could have been instructing
he could have been instructing
we could have been instructing
you could have been instructing
they could have been instructing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't instruct
you couldn't instruct
he couldn't instruct
we couldn't instruct
you couldn't instruct
they couldn't instruct 	I couldn't be instructing
you couldn't be instructing
he couldn't be instructing
we couldn't be instructing
you couldn't be instructing
they couldn't be instructing	I couldn't have instructed
you couldn't have instructed
he couldn't have instructed
we couldn't have instructed
you couldn't have instructed
they couldn't have instructed	I couldn't have been instructing
you couldn't have been instructing
he couldn't have been instructing
we couldn't have been instructing
you couldn't have been instructing
they couldn't have been instructing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I instruct?
could you instruct?
could he instruct?
could we instruct?
could you instruct?
could they instruct? 	could I be instructing?
could you be instructing?
could he be instructing?
could we be instructing?
could you be instructing?
could they be instructing? 	could I have instructed?
could you have instructed?
could he have instructed?
could we have instructed?
could you have instructed?
could they have instructed? 	could I have been instructing?
could you have been instructing?
could he have been instructing?
could we have been instructing?
could you have been instructing?
could they have been instructing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I instruct?
couldn't you instruct?
couldn't he instruct?
couldn't we instruct?
couldn't you instruct?
couldn't they instruct? 	couldn't I be instructing?
couldn't you be instructing?
couldn't he be instructing?
couldn't we be instructing?
couldn't you be instructing?
couldn't they be instructing? 	couldn't I have instructed?
couldn't you have instructed?
couldn't he have instructed?
couldn't we have instructed?
couldn't you have instructed?
couldn't they have instructed? 	couldn't I have been instructing?
couldn't you have been instructing?
couldn't he have been instructing?
couldn't we have been instructing?
couldn't you have been instructing?
couldn't they have been instructing?