English verb conjugation COULD STUDY

Regular verb: study - studied - studied

Affirmation

Simple form

I could study
you could study
he could study
we could study
you could study
they could study

V-ing form

I could be studying
you could be studying
he could be studying
we could be studying
you could be studying
they could be studying

Perfect

I could have studied
you could have studied
he could have studied
we could have studied
you could have studied
they could have studied

V-ing perfect

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

Negation

Simple form

I couldn't study
you couldn't study
he couldn't study
we couldn't study
you couldn't study
they couldn't study

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I study?
could you study?
could he study?
could we study?
could you study?
could they study?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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