English verb conjugation
COULD ROUGHEN

Regular verb: roughen - roughened - roughened

Affirmation

Simple form	V-ing form
I could roughen you could roughen he could roughen we could roughen you could roughen they could roughen	I could be roughening you could be roughening he could be roughening we could be roughening you could be roughening they could be roughening
Perfect	V-ing perfect
I could have roughened you could have roughened he could have roughened we could have roughened you could have roughened they could have roughened	I could have been roughening you could have been roughening he could have been roughening we could have been roughening you could have been roughening they could have been roughening

Negation

Simple form	V-ing form
I couldn't roughen you couldn't roughen he couldn't roughen we couldn't roughen you couldn't roughen they couldn't roughen	I couldn't be roughening you couldn't be roughening he couldn't be roughening we couldn't be roughening you couldn't be roughening they couldn't be roughening
Perfect	V-ing perfect
I couldn't have roughened you couldn't have roughened he couldn't have roughened we couldn't have roughened you couldn't have roughened they couldn't have roughened	I couldn't have been roughening you couldn't have been roughening he couldn't have been roughening we couldn't have been roughening you couldn't have been roughening they couldn't have been roughening

Interrogative form

Simple form	V-ing form
could I roughen? could you roughen? could he roughen? could we roughen? could you roughen? could they roughen?	could I be roughening? could you be roughening? could he be roughening? could we be roughening? could you be roughening? could they be roughening?
Perfect	V-ing perfect
could I have roughened? could you have roughened? could he have roughened? could we have roughened? could you have roughened? could they have roughened?	could I have been roughening? could you have been roughening? could he have been roughening? could we have been roughening? could you have been roughening? could they have been roughening?

Interro-negative form

Simple form	V-ing form
couldn't I roughen? couldn't you roughen? couldn't he roughen? couldn't we roughen? couldn't you roughen? couldn't they roughen?	couldn't I be roughening? couldn't you be roughening? couldn't he be roughening? couldn't we be roughening? couldn't you be roughening? couldn't they be roughening?
Perfect	V-ing perfect
couldn't I have roughened? couldn't you have roughened? couldn't he have roughened? couldn't we have roughened? couldn't you have roughened? couldn't they have roughened?	couldn't I have been roughening? couldn't you have been roughening? couldn't he have been roughening? couldn't we have been roughening? couldn't you have been roughening? couldn't they have been roughening?