I must gravitate you must gravitate he must gravitate we must gravitate you must gravitate they must gravitate
V-ing form
I must be gravitating you must be gravitating he must be gravitating we must be gravitating you must be gravitating they must be gravitating
Perfect
I must have gravitated you must have gravitated he must have gravitated we must have gravitated you must have gravitated they must have gravitated
V-ing perfect
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
I must not gravitate you must not gravitate he must not gravitate we must not gravitate you must not gravitate they must not gravitate
V-ing form
I must not be gravitating you must not be gravitating he must not be gravitating we must not be gravitating you must not be gravitating they must not be gravitating
Perfect
I must not have gravitated you must not have gravitated he must not have gravitated we must not have gravitated you must not have gravitated they must not have gravitated
V-ing perfect
I must not have been gravitating you must not have been gravitating he must not have been gravitating we must not have been gravitating you must not have been gravitating they must not have been gravitating
Interrogative form
Simple form
must I gravitate? must you gravitate? must he gravitate? must we gravitate? must you gravitate? must they gravitate?
V-ing form
must I be gravitating? must you be gravitating? must he be gravitating? must we be gravitating? must you be gravitating? must they be gravitating?
Perfect
must I have gravitated? must you have gravitated? must he have gravitated? must we have gravitated? must you have gravitated? must they have gravitated?
V-ing perfect
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
must I not gravitate? must you not gravitate? must he not gravitate? must we not gravitate? must you not gravitate? must they not gravitate?
V-ing form
must I not be gravitating? must you not be gravitating? must he not be gravitating? must we not be gravitating? must you not be gravitating? must they not be gravitating?
Perfect
must I not have gravitated? must you not have gravitated? must he not have gravitated? must we not have gravitated? must you not have gravitated? must they not have gravitated?
V-ing perfect
must I not have been gravitating? must you not have been gravitating? must he not have been gravitating? must we not have been gravitating? must you not have been gravitating? must they not have been gravitating?