I can swear you can swear he can swear we can swear you can swear they can swear
V-ing form
I can be swearing you can be swearing he can be swearing we can be swearing you can be swearing they can be swearing
Perfect
I can have sworn you can have sworn he can have sworn we can have sworn you can have sworn they can have sworn
V-ing perfect
I can have been swearing you can have been swearing he can have been swearing we can have been swearing you can have been swearing they can have been swearing
Negation
Simple form
I cannot swear you cannot swear he cannot swear we cannot swear you cannot swear they cannot swear
V-ing form
I cannot be swearing you cannot be swearing he cannot be swearing we cannot be swearing you cannot be swearing they cannot be swearing
Perfect
I cannot have sworn you cannot have sworn he cannot have sworn we cannot have sworn you cannot have sworn they cannot have sworn
V-ing perfect
I cannot have been swearing you cannot have been swearing he cannot have been swearing we cannot have been swearing you cannot have been swearing they cannot have been swearing
Interrogative form
Simple form
can I swear? can you swear? can he swear? can we swear? can you swear? can they swear?
V-ing form
can I be swearing? can you be swearing? can he be swearing? can we be swearing? can you be swearing? can they be swearing?
Perfect
can I have sworn? can you have sworn? can he have sworn? can we have sworn? can you have sworn? can they have sworn?
V-ing perfect
can I have been swearing? can you have been swearing? can he have been swearing? can we have been swearing? can you have been swearing? can they have been swearing?
Interro-negative form
Simple form
can I not swear? can you not swear? can he not swear? can we not swear? can you not swear? can they not swear?
V-ing form
can I not be swearing? can you not be swearing? can he not be swearing? can we not be swearing? can you not be swearing? can they not be swearing?
Perfect
can I not have sworn? can you not have sworn? can he not have sworn? can we not have sworn? can you not have sworn? can they not have sworn?
V-ing perfect
can I not have been swearing? can you not have been swearing? can he not have been swearing? can we not have been swearing? can you not have been swearing? can they not have been swearing?