English verb conjugation
COULD INJECT

Regular verb: inject - injected - injected

Affirmation

Simple form	V-ing form
I could inject you could inject he could inject we could inject you could inject they could inject	I could be injecting you could be injecting he could be injecting we could be injecting you could be injecting they could be injecting
Perfect	V-ing perfect
I could have injected you could have injected he could have injected we could have injected you could have injected they could have injected	I could have been injecting you could have been injecting he could have been injecting we could have been injecting you could have been injecting they could have been injecting

Negation

Simple form	V-ing form
I could not inject you could not inject he could not inject we could not inject you could not inject they could not inject	I could not be injecting you could not be injecting he could not be injecting we could not be injecting you could not be injecting they could not be injecting
Perfect	V-ing perfect
I could not have injected you could not have injected he could not have injected we could not have injected you could not have injected they could not have injected	I could not have been injecting you could not have been injecting he could not have been injecting we could not have been injecting you could not have been injecting they could not have been injecting

Interrogative form

Simple form	V-ing form
could I inject? could you inject? could he inject? could we inject? could you inject? could they inject?	could I be injecting? could you be injecting? could he be injecting? could we be injecting? could you be injecting? could they be injecting?
Perfect	V-ing perfect
could I have injected? could you have injected? could he have injected? could we have injected? could you have injected? could they have injected?	could I have been injecting? could you have been injecting? could he have been injecting? could we have been injecting? could you have been injecting? could they have been injecting?

Interro-negative form

Simple form	V-ing form
could I not inject? could you not inject? could he not inject? could we not inject? could you not inject? could they not inject?	could I not be injecting? could you not be injecting? could he not be injecting? could we not be injecting? could you not be injecting? could they not be injecting?
Perfect	V-ing perfect
could I not have injected? could you not have injected? could he not have injected? could we not have injected? could you not have injected? could they not have injected?	could I not have been injecting? could you not have been injecting? could he not have been injecting? could we not have been injecting? could you not have been injecting? could they not have been injecting?