I must involve you must involve he must involve we must involve you must involve they must involve
V-ing form
I must be involving you must be involving he must be involving we must be involving you must be involving they must be involving
Perfect
I must have involved you must have involved he must have involved we must have involved you must have involved they must have involved
V-ing perfect
I must have been involving you must have been involving he must have been involving we must have been involving you must have been involving they must have been involving
Negation
Simple form
I must not involve you must not involve he must not involve we must not involve you must not involve they must not involve
V-ing form
I must not be involving you must not be involving he must not be involving we must not be involving you must not be involving they must not be involving
Perfect
I must not have involved you must not have involved he must not have involved we must not have involved you must not have involved they must not have involved
V-ing perfect
I must not have been involving you must not have been involving he must not have been involving we must not have been involving you must not have been involving they must not have been involving
Interrogative form
Simple form
must I involve? must you involve? must he involve? must we involve? must you involve? must they involve?
V-ing form
must I be involving? must you be involving? must he be involving? must we be involving? must you be involving? must they be involving?
Perfect
must I have involved? must you have involved? must he have involved? must we have involved? must you have involved? must they have involved?
V-ing perfect
must I have been involving? must you have been involving? must he have been involving? must we have been involving? must you have been involving? must they have been involving?
Interro-negative form
Simple form
must I not involve? must you not involve? must he not involve? must we not involve? must you not involve? must they not involve?
V-ing form
must I not be involving? must you not be involving? must he not be involving? must we not be involving? must you not be involving? must they not be involving?
Perfect
must I not have involved? must you not have involved? must he not have involved? must we not have involved? must you not have involved? must they not have involved?
V-ing perfect
must I not have been involving? must you not have been involving? must he not have been involving? must we not have been involving? must you not have been involving? must they not have been involving?