I can highlight you can highlight he can highlight we can highlight you can highlight they can highlight
V-ing form
I can be highlighting you can be highlighting he can be highlighting we can be highlighting you can be highlighting they can be highlighting
Perfect
I can have highlighted you can have highlighted he can have highlighted we can have highlighted you can have highlighted they can have highlighted
V-ing perfect
I can have been highlighting you can have been highlighting he can have been highlighting we can have been highlighting you can have been highlighting they can have been highlighting
Negation
Simple form
I cannot highlight you cannot highlight he cannot highlight we cannot highlight you cannot highlight they cannot highlight
V-ing form
I cannot be highlighting you cannot be highlighting he cannot be highlighting we cannot be highlighting you cannot be highlighting they cannot be highlighting
Perfect
I cannot have highlighted you cannot have highlighted he cannot have highlighted we cannot have highlighted you cannot have highlighted they cannot have highlighted
V-ing perfect
I cannot have been highlighting you cannot have been highlighting he cannot have been highlighting we cannot have been highlighting you cannot have been highlighting they cannot have been highlighting
Interrogative form
Simple form
can I highlight? can you highlight? can he highlight? can we highlight? can you highlight? can they highlight?
V-ing form
can I be highlighting? can you be highlighting? can he be highlighting? can we be highlighting? can you be highlighting? can they be highlighting?
Perfect
can I have highlighted? can you have highlighted? can he have highlighted? can we have highlighted? can you have highlighted? can they have highlighted?
V-ing perfect
can I have been highlighting? can you have been highlighting? can he have been highlighting? can we have been highlighting? can you have been highlighting? can they have been highlighting?
Interro-negative form
Simple form
can I not highlight? can you not highlight? can he not highlight? can we not highlight? can you not highlight? can they not highlight?
V-ing form
can I not be highlighting? can you not be highlighting? can he not be highlighting? can we not be highlighting? can you not be highlighting? can they not be highlighting?
Perfect
can I not have highlighted? can you not have highlighted? can he not have highlighted? can we not have highlighted? can you not have highlighted? can they not have highlighted?
V-ing perfect
can I not have been highlighting? can you not have been highlighting? can he not have been highlighting? can we not have been highlighting? can you not have been highlighting? can they not have been highlighting?