could inject
Regular verb: inject - injected- injected

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?