must grasp
Regular verb: grasp - grasped- grasped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must grasp
you must grasp
he must grasp
we must grasp
you must grasp
they must grasp 	I must be grasping
you must be grasping
he must be grasping
we must be grasping
you must be grasping
they must be grasping	I must have grasped
you must have grasped
he must have grasped
we must have grasped
you must have grasped
they must have grasped	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 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't grasp
you mustn't grasp
he mustn't grasp
we mustn't grasp
you mustn't grasp
they mustn't grasp 	I mustn't be grasping
you mustn't be grasping
he mustn't be grasping
we mustn't be grasping
you mustn't be grasping
they mustn't be grasping	I mustn't have grasped
you mustn't have grasped
he mustn't have grasped
we mustn't have grasped
you mustn't have grasped
they mustn't have grasped	I mustn't have been grasping
you mustn't have been grasping
he mustn't have been grasping
we mustn't have been grasping
you mustn't have been grasping
they mustn't have been grasping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I grasp?
must you grasp?
must he grasp?
must we grasp?
must you grasp?
must they grasp? 	must I be grasping?
must you be grasping?
must he be grasping?
must we be grasping?
must you be grasping?
must they be grasping? 	must I have grasped?
must you have grasped?
must he have grasped?
must we have grasped?
must you have grasped?
must they have grasped? 	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 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I grasp?
mustn't you grasp?
mustn't he grasp?
mustn't we grasp?
mustn't you grasp?
mustn't they grasp? 	mustn't I be grasping?
mustn't you be grasping?
mustn't he be grasping?
mustn't we be grasping?
mustn't you be grasping?
mustn't they be grasping? 	mustn't I have grasped?
mustn't you have grasped?
mustn't he have grasped?
mustn't we have grasped?
mustn't you have grasped?
mustn't they have grasped? 	mustn't I have been grasping?
mustn't you have been grasping?
mustn't he have been grasping?
mustn't we have been grasping?
mustn't you have been grasping?
mustn't they have been grasping?