I must grasp you must grasp he must grasp we must grasp you must grasp they must grasp
V-ing form
I must be grasping you must be grasping he must be grasping we must be grasping you must be grasping they must be grasping
Perfect
I must have grasped you must have grasped he must have grasped we must have grasped you must have grasped they must have grasped
V-ing perfect
I must have been grasping you must have been grasping he must have been grasping we must have been grasping you must have been grasping they must have been grasping
Negation
Simple form
I must not grasp you must not grasp he must not grasp we must not grasp you must not grasp they must not grasp
V-ing form
I must not be grasping you must not be grasping he must not be grasping we must not be grasping you must not be grasping they must not be grasping
Perfect
I must not have grasped you must not have grasped he must not have grasped we must not have grasped you must not have grasped they must not have grasped
V-ing perfect
I must not have been grasping you must not have been grasping he must not have been grasping we must not have been grasping you must not have been grasping they must not have been grasping
Interrogative form
Simple form
must I grasp? must you grasp? must he grasp? must we grasp? must you grasp? must they grasp?
V-ing form
must I be grasping? must you be grasping? must he be grasping? must we be grasping? must you be grasping? must they be grasping?
Perfect
must I have grasped? must you have grasped? must he have grasped? must we have grasped? must you have grasped? must they have grasped?
V-ing perfect
must I have been grasping? must you have been grasping? must he have been grasping? must we have been grasping? must you have been grasping? must they have been grasping?
Interro-negative form
Simple form
must I not grasp? must you not grasp? must he not grasp? must we not grasp? must you not grasp? must they not grasp?
V-ing form
must I not be grasping? must you not be grasping? must he not be grasping? must we not be grasping? must you not be grasping? must they not be grasping?
Perfect
must I not have grasped? must you not have grasped? must he not have grasped? must we not have grasped? must you not have grasped? must they not have grasped?
V-ing perfect
must I not have been grasping? must you not have been grasping? must he not have been grasping? must we not have been grasping? must you not have been grasping? must they not have been grasping?