I can harm you can harm he can harm we can harm you can harm they can harm
V-ing form
I can be harming you can be harming he can be harming we can be harming you can be harming they can be harming
Perfect
I can have harmed you can have harmed he can have harmed we can have harmed you can have harmed they can have harmed
V-ing perfect
I can have been harming you can have been harming he can have been harming we can have been harming you can have been harming they can have been harming
Negation
Simple form
I can't harm you can't harm he can't harm we can't harm you can't harm they can't harm
V-ing form
I can't be harming you can't be harming he can't be harming we can't be harming you can't be harming they can't be harming
Perfect
I can't have harmed you can't have harmed he can't have harmed we can't have harmed you can't have harmed they can't have harmed
V-ing perfect
I can't have been harming you can't have been harming he can't have been harming we can't have been harming you can't have been harming they can't have been harming
Interrogative form
Simple form
can I harm? can you harm? can he harm? can we harm? can you harm? can they harm?
V-ing form
can I be harming? can you be harming? can he be harming? can we be harming? can you be harming? can they be harming?
Perfect
can I have harmed? can you have harmed? can he have harmed? can we have harmed? can you have harmed? can they have harmed?
V-ing perfect
can I have been harming? can you have been harming? can he have been harming? can we have been harming? can you have been harming? can they have been harming?
Interro-negative form
Simple form
can't I harm? can't you harm? can't he harm? can't we harm? can't you harm? can't they harm?
V-ing form
can't I be harming? can't you be harming? can't he be harming? can't we be harming? can't you be harming? can't they be harming?
Perfect
can't I have harmed? can't you have harmed? can't he have harmed? can't we have harmed? can't you have harmed? can't they have harmed?
V-ing perfect
can't I have been harming? can't you have been harming? can't he have been harming? can't we have been harming? can't you have been harming? can't they have been harming?