must treat
Regular verb: treat - treated- treated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must treat
you must treat
she must treat
we must treat
you must treat
they must treat 	I must be treating
you must be treating
she must be treating
we must be treating
you must be treating
they must be treating	I must have treated
you must have treated
she must have treated
we must have treated
you must have treated
they must have treated	I must have been treating
you must have been treating
she must have been treating
we must have been treating
you must have been treating
they must have been treating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't treat
you mustn't treat
she mustn't treat
we mustn't treat
you mustn't treat
they mustn't treat 	I mustn't be treating
you mustn't be treating
she mustn't be treating
we mustn't be treating
you mustn't be treating
they mustn't be treating	I mustn't have treated
you mustn't have treated
she mustn't have treated
we mustn't have treated
you mustn't have treated
they mustn't have treated	I mustn't have been treating
you mustn't have been treating
she mustn't have been treating
we mustn't have been treating
you mustn't have been treating
they mustn't have been treating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I treat?
must you treat?
must she treat?
must we treat?
must you treat?
must they treat? 	must I be treating?
must you be treating?
must she be treating?
must we be treating?
must you be treating?
must they be treating? 	must I have treated?
must you have treated?
must she have treated?
must we have treated?
must you have treated?
must they have treated? 	must I have been treating?
must you have been treating?
must she have been treating?
must we have been treating?
must you have been treating?
must they have been treating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I treat?
mustn't you treat?
mustn't she treat?
mustn't we treat?
mustn't you treat?
mustn't they treat? 	mustn't I be treating?
mustn't you be treating?
mustn't she be treating?
mustn't we be treating?
mustn't you be treating?
mustn't they be treating? 	mustn't I have treated?
mustn't you have treated?
mustn't she have treated?
mustn't we have treated?
mustn't you have treated?
mustn't they have treated? 	mustn't I have been treating?
mustn't you have been treating?
mustn't she have been treating?
mustn't we have been treating?
mustn't you have been treating?
mustn't they have been treating?