English verb conjugation
COULD OVERSTUDY

Regular verb: overstudy - overstudied - overstudied

Affirmation

Simple form	V-ing form
I could overstudy you could overstudy he could overstudy we could overstudy you could overstudy they could overstudy	I could be overstudying you could be overstudying he could be overstudying we could be overstudying you could be overstudying they could be overstudying
Perfect	V-ing perfect
I could have overstudied you could have overstudied he could have overstudied we could have overstudied you could have overstudied they could have overstudied	I could have been overstudying you could have been overstudying he could have been overstudying we could have been overstudying you could have been overstudying they could have been overstudying

Negation

Simple form	V-ing form
I could not overstudy you could not overstudy he could not overstudy we could not overstudy you could not overstudy they could not overstudy	I could not be overstudying you could not be overstudying he could not be overstudying we could not be overstudying you could not be overstudying they could not be overstudying
Perfect	V-ing perfect
I could not have overstudied you could not have overstudied he could not have overstudied we could not have overstudied you could not have overstudied they could not have overstudied	I could not have been overstudying you could not have been overstudying he could not have been overstudying we could not have been overstudying you could not have been overstudying they could not have been overstudying

Interrogative form

Simple form	V-ing form
could I overstudy? could you overstudy? could he overstudy? could we overstudy? could you overstudy? could they overstudy?	could I be overstudying? could you be overstudying? could he be overstudying? could we be overstudying? could you be overstudying? could they be overstudying?
Perfect	V-ing perfect
could I have overstudied? could you have overstudied? could he have overstudied? could we have overstudied? could you have overstudied? could they have overstudied?	could I have been overstudying? could you have been overstudying? could he have been overstudying? could we have been overstudying? could you have been overstudying? could they have been overstudying?

Interro-negative form

Simple form	V-ing form
could I not overstudy? could you not overstudy? could he not overstudy? could we not overstudy? could you not overstudy? could they not overstudy?	could I not be overstudying? could you not be overstudying? could he not be overstudying? could we not be overstudying? could you not be overstudying? could they not be overstudying?
Perfect	V-ing perfect
could I not have overstudied? could you not have overstudied? could he not have overstudied? could we not have overstudied? could you not have overstudied? could they not have overstudied?	could I not have been overstudying? could you not have been overstudying? could he not have been overstudying? could we not have been overstudying? could you not have been overstudying? could they not have been overstudying?