English verb conjugation COULD SHARPEN

Regular verb: sharpen - sharpened - sharpened

Affirmation

Simple form

I could sharpen
you could sharpen
he could sharpen
we could sharpen
you could sharpen
they could sharpen

V-ing form

I could be sharpening
you could be sharpening
he could be sharpening
we could be sharpening
you could be sharpening
they could be sharpening

Perfect

I could have sharpened
you could have sharpened
he could have sharpened
we could have sharpened
you could have sharpened
they could have sharpened

V-ing perfect

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

Negation

Simple form

I could not sharpen
you could not sharpen
he could not sharpen
we could not sharpen
you could not sharpen
they could not sharpen

V-ing form

I could not be sharpening
you could not be sharpening
he could not be sharpening
we could not be sharpening
you could not be sharpening
they could not be sharpening

Perfect

I could not have sharpened
you could not have sharpened
he could not have sharpened
we could not have sharpened
you could not have sharpened
they could not have sharpened

V-ing perfect

I could not have been sharpening
you could not have been sharpening
he could not have been sharpening
we could not have been sharpening
you could not have been sharpening
they could not have been sharpening

Interrogative form

Simple form

could I sharpen?
could you sharpen?
could he sharpen?
could we sharpen?
could you sharpen?
could they sharpen?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

could I not sharpen?
could you not sharpen?
could he not sharpen?
could we not sharpen?
could you not sharpen?
could they not sharpen?

V-ing form

could I not be sharpening?
could you not be sharpening?
could he not be sharpening?
could we not be sharpening?
could you not be sharpening?
could they not be sharpening?

Perfect

could I not have sharpened?
could you not have sharpened?
could he not have sharpened?
could we not have sharpened?
could you not have sharpened?
could they not have sharpened?

V-ing perfect

could I not have been sharpening?
could you not have been sharpening?
could he not have been sharpening?
could we not have been sharpening?
could you not have been sharpening?
could they not have been sharpening?

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