English verb conjugation COULD KNURL

Regular verb: knurl - knurled - knurled

Affirmation

Simple form

I could knurl
you could knurl
he could knurl
we could knurl
you could knurl
they could knurl

V-ing form

I could be knurling
you could be knurling
he could be knurling
we could be knurling
you could be knurling
they could be knurling

Perfect

I could have knurled
you could have knurled
he could have knurled
we could have knurled
you could have knurled
they could have knurled

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I knurl?
could you knurl?
could he knurl?
could we knurl?
could you knurl?
could they knurl?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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