English verb conjugation COULD UNDERSTUDY

Regular verb: understudy - understudied - understudied

Affirmation

Simple form

I could understudy
you could understudy
he could understudy
we could understudy
you could understudy
they could understudy

V-ing form

I could be understudying
you could be understudying
he could be understudying
we could be understudying
you could be understudying
they could be understudying

Perfect

I could have understudied
you could have understudied
he could have understudied
we could have understudied
you could have understudied
they could have understudied

V-ing perfect

I could have been understudying
you could have been understudying
he could have been understudying
we could have been understudying
you could have been understudying
they could have been understudying

Negation

Simple form

I could not understudy
you could not understudy
he could not understudy
we could not understudy
you could not understudy
they could not understudy

V-ing form

I could not be understudying
you could not be understudying
he could not be understudying
we could not be understudying
you could not be understudying
they could not be understudying

Perfect

I could not have understudied
you could not have understudied
he could not have understudied
we could not have understudied
you could not have understudied
they could not have understudied

V-ing perfect

I could not have been understudying
you could not have been understudying
he could not have been understudying
we could not have been understudying
you could not have been understudying
they could not have been understudying

Interrogative form

Simple form

could I understudy?
could you understudy?
could he understudy?
could we understudy?
could you understudy?
could they understudy?

V-ing form

could I be understudying?
could you be understudying?
could he be understudying?
could we be understudying?
could you be understudying?
could they be understudying?

Perfect

could I have understudied?
could you have understudied?
could he have understudied?
could we have understudied?
could you have understudied?
could they have understudied?

V-ing perfect

could I have been understudying?
could you have been understudying?
could he have been understudying?
could we have been understudying?
could you have been understudying?
could they have been understudying?

Interro-negative form

Simple form

could I not understudy?
could you not understudy?
could he not understudy?
could we not understudy?
could you not understudy?
could they not understudy?

V-ing form

could I not be understudying?
could you not be understudying?
could he not be understudying?
could we not be understudying?
could you not be understudying?
could they not be understudying?

Perfect

could I not have understudied?
could you not have understudied?
could he not have understudied?
could we not have understudied?
could you not have understudied?
could they not have understudied?

V-ing perfect

could I not have been understudying?
could you not have been understudying?
could he not have been understudying?
could we not have been understudying?
could you not have been understudying?
could they not have been understudying?

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