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 couldn't preoccupy you couldn't preoccupy he couldn't preoccupy we couldn't preoccupy you couldn't preoccupy they couldn't preoccupy
V-ing form
I couldn't be preoccupying you couldn't be preoccupying he couldn't be preoccupying we couldn't be preoccupying you couldn't be preoccupying they couldn't be preoccupying
Perfect
I couldn't have preoccupied you couldn't have preoccupied he couldn't have preoccupied we couldn't have preoccupied you couldn't have preoccupied they couldn't have preoccupied
V-ing perfect
I couldn't have been preoccupying you couldn't have been preoccupying he couldn't have been preoccupying we couldn't have been preoccupying you couldn't have been preoccupying they couldn't 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
couldn't I preoccupy? couldn't you preoccupy? couldn't he preoccupy? couldn't we preoccupy? couldn't you preoccupy? couldn't they preoccupy?
V-ing form
couldn't I be preoccupying? couldn't you be preoccupying? couldn't he be preoccupying? couldn't we be preoccupying? couldn't you be preoccupying? couldn't they be preoccupying?
Perfect
couldn't I have preoccupied? couldn't you have preoccupied? couldn't he have preoccupied? couldn't we have preoccupied? couldn't you have preoccupied? couldn't they have preoccupied?
V-ing perfect
couldn't I have been preoccupying? couldn't you have been preoccupying? couldn't he have been preoccupying? couldn't we have been preoccupying? couldn't you have been preoccupying? couldn't they have been preoccupying?