must grate
Regular verb: grate - grated- grated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must grate
you must grate
he must grate
we must grate
you must grate
they must grate 	I must be grating
you must be grating
he must be grating
we must be grating
you must be grating
they must be grating	I must have grated
you must have grated
he must have grated
we must have grated
you must have grated
they must have grated	I must have been grating
you must have been grating
he must have been grating
we must have been grating
you must have been grating
they must have been grating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't grate
you mustn't grate
he mustn't grate
we mustn't grate
you mustn't grate
they mustn't grate 	I mustn't be grating
you mustn't be grating
he mustn't be grating
we mustn't be grating
you mustn't be grating
they mustn't be grating	I mustn't have grated
you mustn't have grated
he mustn't have grated
we mustn't have grated
you mustn't have grated
they mustn't have grated	I mustn't have been grating
you mustn't have been grating
he mustn't have been grating
we mustn't have been grating
you mustn't have been grating
they mustn't have been grating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I grate?
must you grate?
must he grate?
must we grate?
must you grate?
must they grate? 	must I be grating?
must you be grating?
must he be grating?
must we be grating?
must you be grating?
must they be grating? 	must I have grated?
must you have grated?
must he have grated?
must we have grated?
must you have grated?
must they have grated? 	must I have been grating?
must you have been grating?
must he have been grating?
must we have been grating?
must you have been grating?
must they have been grating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I grate?
mustn't you grate?
mustn't he grate?
mustn't we grate?
mustn't you grate?
mustn't they grate? 	mustn't I be grating?
mustn't you be grating?
mustn't he be grating?
mustn't we be grating?
mustn't you be grating?
mustn't they be grating? 	mustn't I have grated?
mustn't you have grated?
mustn't he have grated?
mustn't we have grated?
mustn't you have grated?
mustn't they have grated? 	mustn't I have been grating?
mustn't you have been grating?
mustn't he have been grating?
mustn't we have been grating?
mustn't you have been grating?
mustn't they have been grating?