English verb conjugation
SHOULD PREHEAT

Regular verb: preheat - preheated - preheated

Affirmation

Simple form	V-ing form
I should preheat you should preheat she should preheat we should preheat you should preheat they should preheat	I should be preheating you should be preheating she should be preheating we should be preheating you should be preheating they should be preheating
Perfect	V-ing perfect
I should have preheated you should have preheated she should have preheated we should have preheated you should have preheated they should have preheated	I should have been preheating you should have been preheating she should have been preheating we should have been preheating you should have been preheating they should have been preheating

Negation

Simple form	V-ing form
I should not preheat you should not preheat she should not preheat we should not preheat you should not preheat they should not preheat	I should not be preheating you should not be preheating she should not be preheating we should not be preheating you should not be preheating they should not be preheating
Perfect	V-ing perfect
I should not have preheated you should not have preheated she should not have preheated we should not have preheated you should not have preheated they should not have preheated	I should not have been preheating you should not have been preheating she should not have been preheating we should not have been preheating you should not have been preheating they should not have been preheating

Interrogative form

Simple form	V-ing form
should I preheat? should you preheat? should she preheat? should we preheat? should you preheat? should they preheat?	should I be preheating? should you be preheating? should she be preheating? should we be preheating? should you be preheating? should they be preheating?
Perfect	V-ing perfect
should I have preheated? should you have preheated? should she have preheated? should we have preheated? should you have preheated? should they have preheated?	should I have been preheating? should you have been preheating? should she have been preheating? should we have been preheating? should you have been preheating? should they have been preheating?

Interro-negative form

Simple form	V-ing form
should I not preheat? should you not preheat? should she not preheat? should we not preheat? should you not preheat? should they not preheat?	should I not be preheating? should you not be preheating? should she not be preheating? should we not be preheating? should you not be preheating? should they not be preheating?
Perfect	V-ing perfect
should I not have preheated? should you not have preheated? should she not have preheated? should we not have preheated? should you not have preheated? should they not have preheated?	should I not have been preheating? should you not have been preheating? should she not have been preheating? should we not have been preheating? should you not have been preheating? should they not have been preheating?