I could oversee you could oversee he could oversee we could oversee you could oversee they could oversee
V-ing form
I could be overseeing you could be overseeing he could be overseeing we could be overseeing you could be overseeing they could be overseeing
Perfect
I could have overseen you could have overseen he could have overseen we could have overseen you could have overseen they could have overseen
V-ing perfect
I could have been overseeing you could have been overseeing he could have been overseeing we could have been overseeing you could have been overseeing they could have been overseeing
Negation
Simple form
I couldn't oversee you couldn't oversee he couldn't oversee we couldn't oversee you couldn't oversee they couldn't oversee
V-ing form
I couldn't be overseeing you couldn't be overseeing he couldn't be overseeing we couldn't be overseeing you couldn't be overseeing they couldn't be overseeing
Perfect
I couldn't have overseen you couldn't have overseen he couldn't have overseen we couldn't have overseen you couldn't have overseen they couldn't have overseen
V-ing perfect
I couldn't have been overseeing you couldn't have been overseeing he couldn't have been overseeing we couldn't have been overseeing you couldn't have been overseeing they couldn't have been overseeing
Interrogative form
Simple form
could I oversee? could you oversee? could he oversee? could we oversee? could you oversee? could they oversee?
V-ing form
could I be overseeing? could you be overseeing? could he be overseeing? could we be overseeing? could you be overseeing? could they be overseeing?
Perfect
could I have overseen? could you have overseen? could he have overseen? could we have overseen? could you have overseen? could they have overseen?
V-ing perfect
could I have been overseeing? could you have been overseeing? could he have been overseeing? could we have been overseeing? could you have been overseeing? could they have been overseeing?
Interro-negative form
Simple form
couldn't I oversee? couldn't you oversee? couldn't he oversee? couldn't we oversee? couldn't you oversee? couldn't they oversee?
V-ing form
couldn't I be overseeing? couldn't you be overseeing? couldn't he be overseeing? couldn't we be overseeing? couldn't you be overseeing? couldn't they be overseeing?
Perfect
couldn't I have overseen? couldn't you have overseen? couldn't he have overseen? couldn't we have overseen? couldn't you have overseen? couldn't they have overseen?
V-ing perfect
couldn't I have been overseeing? couldn't you have been overseeing? couldn't he have been overseeing? couldn't we have been overseeing? couldn't you have been overseeing? couldn't they have been overseeing?