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 couldn't concenter
you couldn't concenter
he couldn't concenter
we couldn't concenter
you couldn't concenter
they couldn't concenter

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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

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