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 couldn't sharpen
you couldn't sharpen
he couldn't sharpen
we couldn't sharpen
you couldn't sharpen
they couldn't sharpen

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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

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