English verb conjugation
CAN PREVENT

Regular verb: prevent - prevented - prevented

Affirmation

Simple form	V-ing form
I can prevent you can prevent he can prevent we can prevent you can prevent they can prevent	I can be preventing you can be preventing he can be preventing we can be preventing you can be preventing they can be preventing
Perfect	V-ing perfect
I can have prevented you can have prevented he can have prevented we can have prevented you can have prevented they can have prevented	I can have been preventing you can have been preventing he can have been preventing we can have been preventing you can have been preventing they can have been preventing

Negation

Simple form	V-ing form
I can't prevent you can't prevent he can't prevent we can't prevent you can't prevent they can't prevent	I can't be preventing you can't be preventing he can't be preventing we can't be preventing you can't be preventing they can't be preventing
Perfect	V-ing perfect
I can't have prevented you can't have prevented he can't have prevented we can't have prevented you can't have prevented they can't have prevented	I can't have been preventing you can't have been preventing he 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	V-ing form
can I prevent? can you prevent? can he prevent? can we prevent? can you prevent? can they prevent?	can I be preventing? can you be preventing? can he be preventing? can we be preventing? can you be preventing? can they be preventing?
Perfect	V-ing perfect
can I have prevented? can you have prevented? can he have prevented? can we have prevented? can you have prevented? can they have prevented?	can I have been preventing? can you have been preventing? can he have been preventing? can we have been preventing? can you have been preventing? can they have been preventing?

Interro-negative form

Simple form	V-ing form
can't I prevent? can't you prevent? can't he prevent? can't we prevent? can't you prevent? can't they prevent?	can't I be preventing? can't you be preventing? can't he be preventing? can't we be preventing? can't you be preventing? can't they be preventing?
Perfect	V-ing perfect
can't I have prevented? can't you have prevented? can't he have prevented? can't we have prevented? can't you have prevented? can't they have prevented?	can't I have been preventing? can't you have been preventing? can't he have been preventing? can't we have been preventing? can't you have been preventing? can't they have been preventing?