English verb conjugation
COULD INSTRUCT

Regular verb: instruct - instructed - instructed

Affirmation

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