must pitterpatter
Regular verb: pitterpatter - pitterpattered- pitterpattered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must pitterpatter
you must pitterpatter
he must pitterpatter
we must pitterpatter
you must pitterpatter
they must pitterpatter 	I must be pitterpattering
you must be pitterpattering
he must be pitterpattering
we must be pitterpattering
you must be pitterpattering
they must be pitterpattering	I must have pitterpattered
you must have pitterpattered
he must have pitterpattered
we must have pitterpattered
you must have pitterpattered
they must have pitterpattered	I must have been pitterpattering
you must have been pitterpattering
he must have been pitterpattering
we must have been pitterpattering
you must have been pitterpattering
they must have been pitterpattering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not pitterpatter
you must not pitterpatter
he must not pitterpatter
we must not pitterpatter
you must not pitterpatter
they must not pitterpatter 	I must not be pitterpattering
you must not be pitterpattering
he must not be pitterpattering
we must not be pitterpattering
you must not be pitterpattering
they must not be pitterpattering	I must not have pitterpattered
you must not have pitterpattered
he must not have pitterpattered
we must not have pitterpattered
you must not have pitterpattered
they must not have pitterpattered	I must not have been pitterpattering
you must not have been pitterpattering
he must not have been pitterpattering
we must not have been pitterpattering
you must not have been pitterpattering
they must not have been pitterpattering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I pitterpatter?
must you pitterpatter?
must he pitterpatter?
must we pitterpatter?
must you pitterpatter?
must they pitterpatter? 	must I be pitterpattering?
must you be pitterpattering?
must he be pitterpattering?
must we be pitterpattering?
must you be pitterpattering?
must they be pitterpattering? 	must I have pitterpattered?
must you have pitterpattered?
must he have pitterpattered?
must we have pitterpattered?
must you have pitterpattered?
must they have pitterpattered? 	must I have been pitterpattering?
must you have been pitterpattering?
must he have been pitterpattering?
must we have been pitterpattering?
must you have been pitterpattering?
must they have been pitterpattering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not pitterpatter?
must you not pitterpatter?
must he not pitterpatter?
must we not pitterpatter?
must you not pitterpatter?
must they not pitterpatter? 	must I not be pitterpattering?
must you not be pitterpattering?
must he not be pitterpattering?
must we not be pitterpattering?
must you not be pitterpattering?
must they not be pitterpattering? 	must I not have pitterpattered?
must you not have pitterpattered?
must he not have pitterpattered?
must we not have pitterpattered?
must you not have pitterpattered?
must they not have pitterpattered? 	must I not have been pitterpattering?
must you not have been pitterpattering?
must he not have been pitterpattering?
must we not have been pitterpattering?
must you not have been pitterpattering?
must they not have been pitterpattering?