must crepitate
Regular verb: crepitate - crepitated- crepitated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must crepitate
you must crepitate
he must crepitate
we must crepitate
you must crepitate
they must crepitate 	I must be crepitating
you must be crepitating
he must be crepitating
we must be crepitating
you must be crepitating
they must be crepitating	I must have crepitated
you must have crepitated
he must have crepitated
we must have crepitated
you must have crepitated
they must have crepitated	I must have been crepitating
you must have been crepitating
he must have been crepitating
we must have been crepitating
you must have been crepitating
they must have been crepitating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't crepitate
you mustn't crepitate
he mustn't crepitate
we mustn't crepitate
you mustn't crepitate
they mustn't crepitate 	I mustn't be crepitating
you mustn't be crepitating
he mustn't be crepitating
we mustn't be crepitating
you mustn't be crepitating
they mustn't be crepitating	I mustn't have crepitated
you mustn't have crepitated
he mustn't have crepitated
we mustn't have crepitated
you mustn't have crepitated
they mustn't have crepitated	I mustn't have been crepitating
you mustn't have been crepitating
he mustn't have been crepitating
we mustn't have been crepitating
you mustn't have been crepitating
they mustn't have been crepitating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I crepitate?
must you crepitate?
must he crepitate?
must we crepitate?
must you crepitate?
must they crepitate? 	must I be crepitating?
must you be crepitating?
must he be crepitating?
must we be crepitating?
must you be crepitating?
must they be crepitating? 	must I have crepitated?
must you have crepitated?
must he have crepitated?
must we have crepitated?
must you have crepitated?
must they have crepitated? 	must I have been crepitating?
must you have been crepitating?
must he have been crepitating?
must we have been crepitating?
must you have been crepitating?
must they have been crepitating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I crepitate?
mustn't you crepitate?
mustn't he crepitate?
mustn't we crepitate?
mustn't you crepitate?
mustn't they crepitate? 	mustn't I be crepitating?
mustn't you be crepitating?
mustn't he be crepitating?
mustn't we be crepitating?
mustn't you be crepitating?
mustn't they be crepitating? 	mustn't I have crepitated?
mustn't you have crepitated?
mustn't he have crepitated?
mustn't we have crepitated?
mustn't you have crepitated?
mustn't they have crepitated? 	mustn't I have been crepitating?
mustn't you have been crepitating?
mustn't he have been crepitating?
mustn't we have been crepitating?
mustn't you have been crepitating?
mustn't they have been crepitating?