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