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 couldn't understudy
you couldn't understudy
he couldn't understudy
we couldn't understudy
you couldn't understudy
they couldn't understudy

V-ing form

I couldn't be understudying
you couldn't be understudying
he couldn't be understudying
we couldn't be understudying
you couldn't be understudying
they couldn't be understudying

Perfect

I couldn't have understudied
you couldn't have understudied
he couldn't have understudied
we couldn't have understudied
you couldn't have understudied
they couldn't have understudied

V-ing perfect

I couldn't have been understudying
you couldn't have been understudying
he couldn't have been understudying
we couldn't have been understudying
you couldn't have been understudying
they couldn't 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

couldn't I understudy?
couldn't you understudy?
couldn't he understudy?
couldn't we understudy?
couldn't you understudy?
couldn't they understudy?

V-ing form

couldn't I be understudying?
couldn't you be understudying?
couldn't he be understudying?
couldn't we be understudying?
couldn't you be understudying?
couldn't they be understudying?

Perfect

couldn't I have understudied?
couldn't you have understudied?
couldn't he have understudied?
couldn't we have understudied?
couldn't you have understudied?
couldn't they have understudied?

V-ing perfect

couldn't I have been understudying?
couldn't you have been understudying?
couldn't he have been understudying?
couldn't we have been understudying?
couldn't you have been understudying?
couldn't they have been understudying?

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