English verb conjugation
CAN ROUGHEN

Regular verb: roughen - roughened - roughened

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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