must purr
Regular verb: purr - purred- purred

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must purr
you must purr
she must purr
we must purr
you must purr
they must purr 	I must be purring
you must be purring
she must be purring
we must be purring
you must be purring
they must be purring	I must have purred
you must have purred
she must have purred
we must have purred
you must have purred
they must have purred	I must have been purring
you must have been purring
she must have been purring
we must have been purring
you must have been purring
they must have been purring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not purr
you must not purr
she must not purr
we must not purr
you must not purr
they must not purr 	I must not be purring
you must not be purring
she must not be purring
we must not be purring
you must not be purring
they must not be purring	I must not have purred
you must not have purred
she must not have purred
we must not have purred
you must not have purred
they must not have purred	I must not have been purring
you must not have been purring
she must not have been purring
we must not have been purring
you must not have been purring
they must not have been purring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I purr?
must you purr?
must she purr?
must we purr?
must you purr?
must they purr? 	must I be purring?
must you be purring?
must she be purring?
must we be purring?
must you be purring?
must they be purring? 	must I have purred?
must you have purred?
must she have purred?
must we have purred?
must you have purred?
must they have purred? 	must I have been purring?
must you have been purring?
must she have been purring?
must we have been purring?
must you have been purring?
must they have been purring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not purr?
must you not purr?
must she not purr?
must we not purr?
must you not purr?
must they not purr? 	must I not be purring?
must you not be purring?
must she not be purring?
must we not be purring?
must you not be purring?
must they not be purring? 	must I not have purred?
must you not have purred?
must she not have purred?
must we not have purred?
must you not have purred?
must they not have purred? 	must I not have been purring?
must you not have been purring?
must she not have been purring?
must we not have been purring?
must you not have been purring?
must they not have been purring?