must gravitate
Regular verb: gravitate - gravitated- gravitated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must gravitate
you must gravitate
he must gravitate
we must gravitate
you must gravitate
they must gravitate 	I must be gravitating
you must be gravitating
he must be gravitating
we must be gravitating
you must be gravitating
they must be gravitating	I must have gravitated
you must have gravitated
he must have gravitated
we must have gravitated
you must have gravitated
they must have gravitated	I must have been gravitating
you must have been gravitating
he must have been gravitating
we must have been gravitating
you must have been gravitating
they must have been gravitating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't gravitate
you mustn't gravitate
he mustn't gravitate
we mustn't gravitate
you mustn't gravitate
they mustn't gravitate 	I mustn't be gravitating
you mustn't be gravitating
he mustn't be gravitating
we mustn't be gravitating
you mustn't be gravitating
they mustn't be gravitating	I mustn't have gravitated
you mustn't have gravitated
he mustn't have gravitated
we mustn't have gravitated
you mustn't have gravitated
they mustn't have gravitated	I mustn't have been gravitating
you mustn't have been gravitating
he mustn't have been gravitating
we mustn't have been gravitating
you mustn't have been gravitating
they mustn't have been gravitating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I gravitate?
must you gravitate?
must he gravitate?
must we gravitate?
must you gravitate?
must they gravitate? 	must I be gravitating?
must you be gravitating?
must he be gravitating?
must we be gravitating?
must you be gravitating?
must they be gravitating? 	must I have gravitated?
must you have gravitated?
must he have gravitated?
must we have gravitated?
must you have gravitated?
must they have gravitated? 	must I have been gravitating?
must you have been gravitating?
must he have been gravitating?
must we have been gravitating?
must you have been gravitating?
must they have been gravitating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I gravitate?
mustn't you gravitate?
mustn't he gravitate?
mustn't we gravitate?
mustn't you gravitate?
mustn't they gravitate? 	mustn't I be gravitating?
mustn't you be gravitating?
mustn't he be gravitating?
mustn't we be gravitating?
mustn't you be gravitating?
mustn't they be gravitating? 	mustn't I have gravitated?
mustn't you have gravitated?
mustn't he have gravitated?
mustn't we have gravitated?
mustn't you have gravitated?
mustn't they have gravitated? 	mustn't I have been gravitating?
mustn't you have been gravitating?
mustn't he have been gravitating?
mustn't we have been gravitating?
mustn't you have been gravitating?
mustn't they have been gravitating?