I can swear you can swear she can swear we can swear you can swear they can swear
V-ing form
I can be swearing you can be swearing she can be swearing we can be swearing you can be swearing they can be swearing
Perfect
I can have sworn you can have sworn she 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 she can have been swearing we can have been swearing you can have been swearing they can have been swearing
Negation
Simple form
I can't swear you can't swear she can't swear we can't swear you can't swear they can't swear
V-ing form
I can't be swearing you can't be swearing she can't be swearing we can't be swearing you can't be swearing they can't be swearing
Perfect
I can't have sworn you can't have sworn she can't have sworn we can't have sworn you can't have sworn they can't have sworn
V-ing perfect
I can't have been swearing you can't have been swearing she can't have been swearing we can't have been swearing you can't have been swearing they can't have been swearing
Interrogative form
Simple form
can I swear? can you swear? can she swear? can we swear? can you swear? can they swear?
V-ing form
can I be swearing? can you be swearing? can she be swearing? can we be swearing? can you be swearing? can they be swearing?
Perfect
can I have sworn? can you have sworn? can she 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 she have been swearing? can we have been swearing? can you have been swearing? can they have been swearing?
Interro-negative form
Simple form
can't I swear? can't you swear? can't she swear? can't we swear? can't you swear? can't they swear?
V-ing form
can't I be swearing? can't you be swearing? can't she be swearing? can't we be swearing? can't you be swearing? can't they be swearing?
Perfect
can't I have sworn? can't you have sworn? can't she have sworn? can't we have sworn? can't you have sworn? can't they have sworn?
V-ing perfect
can't I have been swearing? can't you have been swearing? can't she have been swearing? can't we have been swearing? can't you have been swearing? can't they have been swearing?