English verb conjugation COULD CONCENTER

Regular verb: concenter - concentered - concentered

Affirmation

Simple form

I could concenter
you could concenter
he could concenter
we could concenter
you could concenter
they could concenter

V-ing form

I could be concentering
you could be concentering
he could be concentering
we could be concentering
you could be concentering
they could be concentering

Perfect

I could have concentered
you could have concentered
he could have concentered
we could have concentered
you could have concentered
they could have concentered

V-ing perfect

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

Negation

Simple form

I could not concenter
you could not concenter
he could not concenter
we could not concenter
you could not concenter
they could not concenter

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I concenter?
could you concenter?
could he concenter?
could we concenter?
could you concenter?
could they concenter?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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