must shampoo
Regular verb: shampoo - shampooed- shampooed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must shampoo
you must shampoo
he must shampoo
we must shampoo
you must shampoo
they must shampoo 	I must be shampooing
you must be shampooing
he must be shampooing
we must be shampooing
you must be shampooing
they must be shampooing	I must have shampooed
you must have shampooed
he must have shampooed
we must have shampooed
you must have shampooed
they must have shampooed	I must have been shampooing
you must have been shampooing
he must have been shampooing
we must have been shampooing
you must have been shampooing
they must have been shampooing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not shampoo
you must not shampoo
he must not shampoo
we must not shampoo
you must not shampoo
they must not shampoo 	I must not be shampooing
you must not be shampooing
he must not be shampooing
we must not be shampooing
you must not be shampooing
they must not be shampooing	I must not have shampooed
you must not have shampooed
he must not have shampooed
we must not have shampooed
you must not have shampooed
they must not have shampooed	I must not have been shampooing
you must not have been shampooing
he must not have been shampooing
we must not have been shampooing
you must not have been shampooing
they must not have been shampooing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I shampoo?
must you shampoo?
must he shampoo?
must we shampoo?
must you shampoo?
must they shampoo? 	must I be shampooing?
must you be shampooing?
must he be shampooing?
must we be shampooing?
must you be shampooing?
must they be shampooing? 	must I have shampooed?
must you have shampooed?
must he have shampooed?
must we have shampooed?
must you have shampooed?
must they have shampooed? 	must I have been shampooing?
must you have been shampooing?
must he have been shampooing?
must we have been shampooing?
must you have been shampooing?
must they have been shampooing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not shampoo?
must you not shampoo?
must he not shampoo?
must we not shampoo?
must you not shampoo?
must they not shampoo? 	must I not be shampooing?
must you not be shampooing?
must he not be shampooing?
must we not be shampooing?
must you not be shampooing?
must they not be shampooing? 	must I not have shampooed?
must you not have shampooed?
must he not have shampooed?
must we not have shampooed?
must you not have shampooed?
must they not have shampooed? 	must I not have been shampooing?
must you not have been shampooing?
must he not have been shampooing?
must we not have been shampooing?
must you not have been shampooing?
must they not have been shampooing?