I could preoccupy you could preoccupy he could preoccupy we could preoccupy you could preoccupy they could preoccupy
V-ing form
I could be preoccupying you could be preoccupying he could be preoccupying we could be preoccupying you could be preoccupying they could be preoccupying
Perfect
I could have preoccupied you could have preoccupied he could have preoccupied we could have preoccupied you could have preoccupied they could have preoccupied
V-ing perfect
I could have been preoccupying you could have been preoccupying he could have been preoccupying we could have been preoccupying you could have been preoccupying they could have been preoccupying
Negation
Simple form
I could not preoccupy you could not preoccupy he could not preoccupy we could not preoccupy you could not preoccupy they could not preoccupy
V-ing form
I could not be preoccupying you could not be preoccupying he could not be preoccupying we could not be preoccupying you could not be preoccupying they could not be preoccupying
Perfect
I could not have preoccupied you could not have preoccupied he could not have preoccupied we could not have preoccupied you could not have preoccupied they could not have preoccupied
V-ing perfect
I could not have been preoccupying you could not have been preoccupying he could not have been preoccupying we could not have been preoccupying you could not have been preoccupying they could not have been preoccupying
Interrogative form
Simple form
could I preoccupy? could you preoccupy? could he preoccupy? could we preoccupy? could you preoccupy? could they preoccupy?
V-ing form
could I be preoccupying? could you be preoccupying? could he be preoccupying? could we be preoccupying? could you be preoccupying? could they be preoccupying?
Perfect
could I have preoccupied? could you have preoccupied? could he have preoccupied? could we have preoccupied? could you have preoccupied? could they have preoccupied?
V-ing perfect
could I have been preoccupying? could you have been preoccupying? could he have been preoccupying? could we have been preoccupying? could you have been preoccupying? could they have been preoccupying?
Interro-negative form
Simple form
could I not preoccupy? could you not preoccupy? could he not preoccupy? could we not preoccupy? could you not preoccupy? could they not preoccupy?
V-ing form
could I not be preoccupying? could you not be preoccupying? could he not be preoccupying? could we not be preoccupying? could you not be preoccupying? could they not be preoccupying?
Perfect
could I not have preoccupied? could you not have preoccupied? could he not have preoccupied? could we not have preoccupied? could you not have preoccupied? could they not have preoccupied?
V-ing perfect
could I not have been preoccupying? could you not have been preoccupying? could he not have been preoccupying? could we not have been preoccupying? could you not have been preoccupying? could they not have been preoccupying?