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