I can prevent you can prevent she can prevent we can prevent you can prevent they can prevent
V-ing form
I can be preventing you can be preventing she can be preventing we can be preventing you can be preventing they can be preventing
Perfect
I can have prevented you can have prevented she can have prevented we can have prevented you can have prevented they can have prevented
V-ing perfect
I can have been preventing you can have been preventing she can have been preventing we can have been preventing you can have been preventing they can have been preventing
Negation
Simple form
I can't prevent you can't prevent she can't prevent we can't prevent you can't prevent they can't prevent
V-ing form
I can't be preventing you can't be preventing she can't be preventing we can't be preventing you can't be preventing they can't be preventing
Perfect
I can't have prevented you can't have prevented she can't have prevented we can't have prevented you can't have prevented they can't have prevented
V-ing perfect
I can't have been preventing you can't have been preventing she can't have been preventing we can't have been preventing you can't have been preventing they can't have been preventing
Interrogative form
Simple form
can I prevent? can you prevent? can she prevent? can we prevent? can you prevent? can they prevent?
V-ing form
can I be preventing? can you be preventing? can she be preventing? can we be preventing? can you be preventing? can they be preventing?
Perfect
can I have prevented? can you have prevented? can she have prevented? can we have prevented? can you have prevented? can they have prevented?
V-ing perfect
can I have been preventing? can you have been preventing? can she have been preventing? can we have been preventing? can you have been preventing? can they have been preventing?
Interro-negative form
Simple form
can't I prevent? can't you prevent? can't she prevent? can't we prevent? can't you prevent? can't they prevent?
V-ing form
can't I be preventing? can't you be preventing? can't she be preventing? can't we be preventing? can't you be preventing? can't they be preventing?
Perfect
can't I have prevented? can't you have prevented? can't she have prevented? can't we have prevented? can't you have prevented? can't they have prevented?
V-ing perfect
can't I have been preventing? can't you have been preventing? can't she have been preventing? can't we have been preventing? can't you have been preventing? can't they have been preventing?