English verb conjugation
COULD HARSHEN

Regular verb: harshen - harshened - harshened

Affirmation

Simple form	V-ing form
I could harshen you could harshen he could harshen we could harshen you could harshen they could harshen	I could be harshening you could be harshening he could be harshening we could be harshening you could be harshening they could be harshening
Perfect	V-ing perfect
I could have harshened you could have harshened he could have harshened we could have harshened you could have harshened they could have harshened	I could have been harshening you could have been harshening he could have been harshening we could have been harshening you could have been harshening they could have been harshening

Negation

Simple form	V-ing form
I couldn't harshen you couldn't harshen he couldn't harshen we couldn't harshen you couldn't harshen they couldn't harshen	I couldn't be harshening you couldn't be harshening he couldn't be harshening we couldn't be harshening you couldn't be harshening they couldn't be harshening
Perfect	V-ing perfect
I couldn't have harshened you couldn't have harshened he couldn't have harshened we couldn't have harshened you couldn't have harshened they couldn't have harshened	I couldn't have been harshening you couldn't have been harshening he couldn't have been harshening we couldn't have been harshening you couldn't have been harshening they couldn't have been harshening

Interrogative form

Simple form	V-ing form
could I harshen? could you harshen? could he harshen? could we harshen? could you harshen? could they harshen?	could I be harshening? could you be harshening? could he be harshening? could we be harshening? could you be harshening? could they be harshening?
Perfect	V-ing perfect
could I have harshened? could you have harshened? could he have harshened? could we have harshened? could you have harshened? could they have harshened?	could I have been harshening? could you have been harshening? could he have been harshening? could we have been harshening? could you have been harshening? could they have been harshening?

Interro-negative form

Simple form	V-ing form
couldn't I harshen? couldn't you harshen? couldn't he harshen? couldn't we harshen? couldn't you harshen? couldn't they harshen?	couldn't I be harshening? couldn't you be harshening? couldn't he be harshening? couldn't we be harshening? couldn't you be harshening? couldn't they be harshening?
Perfect	V-ing perfect
couldn't I have harshened? couldn't you have harshened? couldn't he have harshened? couldn't we have harshened? couldn't you have harshened? couldn't they have harshened?	couldn't I have been harshening? couldn't you have been harshening? couldn't he have been harshening? couldn't we have been harshening? couldn't you have been harshening? couldn't they have been harshening?