English verb conjugation
SHOULD FLATTEN

Regular verb: flatten - flattened - flattened

Affirmation

Simple form	V-ing form
I should flatten you should flatten she should flatten we should flatten you should flatten they should flatten	I should be flattening you should be flattening she should be flattening we should be flattening you should be flattening they should be flattening
Perfect	V-ing perfect
I should have flattened you should have flattened she should have flattened we should have flattened you should have flattened they should have flattened	I should have been flattening you should have been flattening she should have been flattening we should have been flattening you should have been flattening they should have been flattening

Negation

Simple form	V-ing form
I should not flatten you should not flatten she should not flatten we should not flatten you should not flatten they should not flatten	I should not be flattening you should not be flattening she should not be flattening we should not be flattening you should not be flattening they should not be flattening
Perfect	V-ing perfect
I should not have flattened you should not have flattened she should not have flattened we should not have flattened you should not have flattened they should not have flattened	I should not have been flattening you should not have been flattening she should not have been flattening we should not have been flattening you should not have been flattening they should not have been flattening

Interrogative form

Simple form	V-ing form
should I flatten? should you flatten? should she flatten? should we flatten? should you flatten? should they flatten?	should I be flattening? should you be flattening? should she be flattening? should we be flattening? should you be flattening? should they be flattening?
Perfect	V-ing perfect
should I have flattened? should you have flattened? should she have flattened? should we have flattened? should you have flattened? should they have flattened?	should I have been flattening? should you have been flattening? should she have been flattening? should we have been flattening? should you have been flattening? should they have been flattening?

Interro-negative form

Simple form	V-ing form
should I not flatten? should you not flatten? should she not flatten? should we not flatten? should you not flatten? should they not flatten?	should I not be flattening? should you not be flattening? should she not be flattening? should we not be flattening? should you not be flattening? should they not be flattening?
Perfect	V-ing perfect
should I not have flattened? should you not have flattened? should she not have flattened? should we not have flattened? should you not have flattened? should they not have flattened?	should I not have been flattening? should you not have been flattening? should she not have been flattening? should we not have been flattening? should you not have been flattening? should they not have been flattening?