English verb conjugation
COULD INJECT

Regular verb: inject - injected - injected

Affirmation

Simple form	V-ing form
I could inject you could inject she could inject we could inject you could inject they could inject	I could be injecting you could be injecting she 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 she 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 she 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 couldn't inject you couldn't inject she couldn't inject we couldn't inject you couldn't inject they couldn't inject	I couldn't be injecting you couldn't be injecting she couldn't be injecting we couldn't be injecting you couldn't be injecting they couldn't be injecting
Perfect	V-ing perfect
I couldn't have injected you couldn't have injected she couldn't have injected we couldn't have injected you couldn't have injected they couldn't have injected	I couldn't have been injecting you couldn't have been injecting she couldn't have been injecting we couldn't have been injecting you couldn't have been injecting they couldn't have been injecting

Interrogative form

Simple form	V-ing form
could I inject? could you inject? could she inject? could we inject? could you inject? could they inject?	could I be injecting? could you be injecting? could she 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 she 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 she 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
couldn't I inject? couldn't you inject? couldn't she inject? couldn't we inject? couldn't you inject? couldn't they inject?	couldn't I be injecting? couldn't you be injecting? couldn't she be injecting? couldn't we be injecting? couldn't you be injecting? couldn't they be injecting?
Perfect	V-ing perfect
couldn't I have injected? couldn't you have injected? couldn't she have injected? couldn't we have injected? couldn't you have injected? couldn't they have injected?	couldn't I have been injecting? couldn't you have been injecting? couldn't she have been injecting? couldn't we have been injecting? couldn't you have been injecting? couldn't they have been injecting?