I can harm you can harm she can harm we can harm you can harm they can harm
V-ing form
I can be harming you can be harming she can be harming we can be harming you can be harming they can be harming
Perfect
I can have harmed you can have harmed she 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 she can have been harming we can have been harming you can have been harming they can have been harming
Negation
Simple form
I cannot harm you cannot harm she cannot harm we cannot harm you cannot harm they cannot harm
V-ing form
I cannot be harming you cannot be harming she cannot be harming we cannot be harming you cannot be harming they cannot be harming
Perfect
I cannot have harmed you cannot have harmed she cannot have harmed we cannot have harmed you cannot have harmed they cannot have harmed
V-ing perfect
I cannot have been harming you cannot have been harming she cannot have been harming we cannot have been harming you cannot have been harming they cannot have been harming
Interrogative form
Simple form
can I harm? can you harm? can she harm? can we harm? can you harm? can they harm?
V-ing form
can I be harming? can you be harming? can she be harming? can we be harming? can you be harming? can they be harming?
Perfect
can I have harmed? can you have harmed? can she 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 she have been harming? can we have been harming? can you have been harming? can they have been harming?
Interro-negative form
Simple form
can I not harm? can you not harm? can she not harm? can we not harm? can you not harm? can they not harm?
V-ing form
can I not be harming? can you not be harming? can she not be harming? can we not be harming? can you not be harming? can they not be harming?
Perfect
can I not have harmed? can you not have harmed? can she not have harmed? can we not have harmed? can you not have harmed? can they not have harmed?
V-ing perfect
can I not have been harming? can you not have been harming? can she not have been harming? can we not have been harming? can you not have been harming? can they not have been harming?