must grunt
Regular verb: grunt - grunted- grunted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must grunt
you must grunt
she must grunt
we must grunt
you must grunt
they must grunt 	I must be grunting
you must be grunting
she must be grunting
we must be grunting
you must be grunting
they must be grunting	I must have grunted
you must have grunted
she must have grunted
we must have grunted
you must have grunted
they must have grunted	I must have been grunting
you must have been grunting
she must have been grunting
we must have been grunting
you must have been grunting
they must have been grunting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not grunt
you must not grunt
she must not grunt
we must not grunt
you must not grunt
they must not grunt 	I must not be grunting
you must not be grunting
she must not be grunting
we must not be grunting
you must not be grunting
they must not be grunting	I must not have grunted
you must not have grunted
she must not have grunted
we must not have grunted
you must not have grunted
they must not have grunted	I must not have been grunting
you must not have been grunting
she must not have been grunting
we must not have been grunting
you must not have been grunting
they must not have been grunting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I grunt?
must you grunt?
must she grunt?
must we grunt?
must you grunt?
must they grunt? 	must I be grunting?
must you be grunting?
must she be grunting?
must we be grunting?
must you be grunting?
must they be grunting? 	must I have grunted?
must you have grunted?
must she have grunted?
must we have grunted?
must you have grunted?
must they have grunted? 	must I have been grunting?
must you have been grunting?
must she have been grunting?
must we have been grunting?
must you have been grunting?
must they have been grunting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not grunt?
must you not grunt?
must she not grunt?
must we not grunt?
must you not grunt?
must they not grunt? 	must I not be grunting?
must you not be grunting?
must she not be grunting?
must we not be grunting?
must you not be grunting?
must they not be grunting? 	must I not have grunted?
must you not have grunted?
must she not have grunted?
must we not have grunted?
must you not have grunted?
must they not have grunted? 	must I not have been grunting?
must you not have been grunting?
must she not have been grunting?
must we not have been grunting?
must you not have been grunting?
must they not have been grunting?