English verb conjugation COULD CONCERT

Regular verb: concert - concerted - concerted

Affirmation

Simple form

I could concert
you could concert
he could concert
we could concert
you could concert
they could concert

V-ing form

I could be concerting
you could be concerting
he could be concerting
we could be concerting
you could be concerting
they could be concerting

Perfect

I could have concerted
you could have concerted
he could have concerted
we could have concerted
you could have concerted
they could have concerted

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I concert?
could you concert?
could he concert?
could we concert?
could you concert?
could they concert?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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