English verb conjugation COULD CHECKER

Regular verb: checker - checkered - checkered

Affirmation

Simple form

I could checker
you could checker
he could checker
we could checker
you could checker
they could checker

V-ing form

I could be checkering
you could be checkering
he could be checkering
we could be checkering
you could be checkering
they could be checkering

Perfect

I could have checkered
you could have checkered
he could have checkered
we could have checkered
you could have checkered
they could have checkered

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I checker?
could you checker?
could he checker?
could we checker?
could you checker?
could they checker?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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