must crossruff
Regular verb: crossruff - crossruffed- crossruffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must crossruff
you must crossruff
he must crossruff
we must crossruff
you must crossruff
they must crossruff 	I must be crossruffing
you must be crossruffing
he must be crossruffing
we must be crossruffing
you must be crossruffing
they must be crossruffing	I must have crossruffed
you must have crossruffed
he must have crossruffed
we must have crossruffed
you must have crossruffed
they must have crossruffed	I must have been crossruffing
you must have been crossruffing
he must have been crossruffing
we must have been crossruffing
you must have been crossruffing
they must have been crossruffing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not crossruff
you must not crossruff
he must not crossruff
we must not crossruff
you must not crossruff
they must not crossruff 	I must not be crossruffing
you must not be crossruffing
he must not be crossruffing
we must not be crossruffing
you must not be crossruffing
they must not be crossruffing	I must not have crossruffed
you must not have crossruffed
he must not have crossruffed
we must not have crossruffed
you must not have crossruffed
they must not have crossruffed	I must not have been crossruffing
you must not have been crossruffing
he must not have been crossruffing
we must not have been crossruffing
you must not have been crossruffing
they must not have been crossruffing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I crossruff?
must you crossruff?
must he crossruff?
must we crossruff?
must you crossruff?
must they crossruff? 	must I be crossruffing?
must you be crossruffing?
must he be crossruffing?
must we be crossruffing?
must you be crossruffing?
must they be crossruffing? 	must I have crossruffed?
must you have crossruffed?
must he have crossruffed?
must we have crossruffed?
must you have crossruffed?
must they have crossruffed? 	must I have been crossruffing?
must you have been crossruffing?
must he have been crossruffing?
must we have been crossruffing?
must you have been crossruffing?
must they have been crossruffing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not crossruff?
must you not crossruff?
must he not crossruff?
must we not crossruff?
must you not crossruff?
must they not crossruff? 	must I not be crossruffing?
must you not be crossruffing?
must he not be crossruffing?
must we not be crossruffing?
must you not be crossruffing?
must they not be crossruffing? 	must I not have crossruffed?
must you not have crossruffed?
must he not have crossruffed?
must we not have crossruffed?
must you not have crossruffed?
must they not have crossruffed? 	must I not have been crossruffing?
must you not have been crossruffing?
must he not have been crossruffing?
must we not have been crossruffing?
must you not have been crossruffing?
must they not have been crossruffing?