I can invoke you can invoke he can invoke we can invoke you can invoke they can invoke
V-ing form
I can be invoking you can be invoking he can be invoking we can be invoking you can be invoking they can be invoking
Perfect
I can have invoked you can have invoked he can have invoked we can have invoked you can have invoked they can have invoked
V-ing perfect
I can have been invoking you can have been invoking he can have been invoking we can have been invoking you can have been invoking they can have been invoking
Negation
Simple form
I cannot invoke you cannot invoke he cannot invoke we cannot invoke you cannot invoke they cannot invoke
V-ing form
I cannot be invoking you cannot be invoking he cannot be invoking we cannot be invoking you cannot be invoking they cannot be invoking
Perfect
I cannot have invoked you cannot have invoked he cannot have invoked we cannot have invoked you cannot have invoked they cannot have invoked
V-ing perfect
I cannot have been invoking you cannot have been invoking he cannot have been invoking we cannot have been invoking you cannot have been invoking they cannot have been invoking
Interrogative form
Simple form
can I invoke? can you invoke? can he invoke? can we invoke? can you invoke? can they invoke?
V-ing form
can I be invoking? can you be invoking? can he be invoking? can we be invoking? can you be invoking? can they be invoking?
Perfect
can I have invoked? can you have invoked? can he have invoked? can we have invoked? can you have invoked? can they have invoked?
V-ing perfect
can I have been invoking? can you have been invoking? can he have been invoking? can we have been invoking? can you have been invoking? can they have been invoking?
Interro-negative form
Simple form
can I not invoke? can you not invoke? can he not invoke? can we not invoke? can you not invoke? can they not invoke?
V-ing form
can I not be invoking? can you not be invoking? can he not be invoking? can we not be invoking? can you not be invoking? can they not be invoking?
Perfect
can I not have invoked? can you not have invoked? can he not have invoked? can we not have invoked? can you not have invoked? can they not have invoked?
V-ing perfect
can I not have been invoking? can you not have been invoking? can he not have been invoking? can we not have been invoking? can you not have been invoking? can they not have been invoking?