English verb conjugation COULD CONCENTRATE

Regular verb: concentrate - concentrated - concentrated

Affirmation

Simple form

I could concentrate
you could concentrate
he could concentrate
we could concentrate
you could concentrate
they could concentrate

V-ing form

I could be concentrating
you could be concentrating
he could be concentrating
we could be concentrating
you could be concentrating
they could be concentrating

Perfect

I could have concentrated
you could have concentrated
he could have concentrated
we could have concentrated
you could have concentrated
they could have concentrated

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I concentrate?
could you concentrate?
could he concentrate?
could we concentrate?
could you concentrate?
could they concentrate?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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