I can inject you can inject he can inject we can inject you can inject they can inject
V-ing form
I can be injecting you can be injecting he can be injecting we can be injecting you can be injecting they can be injecting
Perfect
I can have injected you can have injected he can have injected we can have injected you can have injected they can have injected
V-ing perfect
I can have been injecting you can have been injecting he can have been injecting we can have been injecting you can have been injecting they can have been injecting
Negation
Simple form
I cannot inject you cannot inject he cannot inject we cannot inject you cannot inject they cannot inject
V-ing form
I cannot be injecting you cannot be injecting he cannot be injecting we cannot be injecting you cannot be injecting they cannot be injecting
Perfect
I cannot have injected you cannot have injected he cannot have injected we cannot have injected you cannot have injected they cannot have injected
V-ing perfect
I cannot have been injecting you cannot have been injecting he cannot have been injecting we cannot have been injecting you cannot have been injecting they cannot have been injecting
Interrogative form
Simple form
can I inject? can you inject? can he inject? can we inject? can you inject? can they inject?
V-ing form
can I be injecting? can you be injecting? can he be injecting? can we be injecting? can you be injecting? can they be injecting?
Perfect
can I have injected? can you have injected? can he have injected? can we have injected? can you have injected? can they have injected?
V-ing perfect
can I have been injecting? can you have been injecting? can he have been injecting? can we have been injecting? can you have been injecting? can they have been injecting?
Interro-negative form
Simple form
can I not inject? can you not inject? can he not inject? can we not inject? can you not inject? can they not inject?
V-ing form
can I not be injecting? can you not be injecting? can he not be injecting? can we not be injecting? can you not be injecting? can they not be injecting?
Perfect
can I not have injected? can you not have injected? can he not have injected? can we not have injected? can you not have injected? can they not have injected?
V-ing perfect
can I not have been injecting? can you not have been injecting? can he not have been injecting? can we not have been injecting? can you not have been injecting? can they not have been injecting?