English verb conjugation COULD NAIL

Regular verb: nail - nailed - nailed

Affirmation

Simple form

I could nail
you could nail
he could nail
we could nail
you could nail
they could nail

V-ing form

I could be nailing
you could be nailing
he could be nailing
we could be nailing
you could be nailing
they could be nailing

Perfect

I could have nailed
you could have nailed
he could have nailed
we could have nailed
you could have nailed
they could have nailed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I nail?
could you nail?
could he nail?
could we nail?
could you nail?
could they nail?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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