English verb conjugation
SHOULD START

Regular verb: start - started - started

Affirmation

Simple form	V-ing form
I should start you should start he should start we should start you should start they should start	I should be starting you should be starting he should be starting we should be starting you should be starting they should be starting
Perfect	V-ing perfect
I should have started you should have started he should have started we should have started you should have started they should have started	I should have been starting you should have been starting he should have been starting we should have been starting you should have been starting they should have been starting

Negation

Simple form	V-ing form
I should not start you should not start he should not start we should not start you should not start they should not start	I should not be starting you should not be starting he should not be starting we should not be starting you should not be starting they should not be starting
Perfect	V-ing perfect
I should not have started you should not have started he should not have started we should not have started you should not have started they should not have started	I should not have been starting you should not have been starting he should not have been starting we should not have been starting you should not have been starting they should not have been starting

Interrogative form

Simple form	V-ing form
should I start? should you start? should he start? should we start? should you start? should they start?	should I be starting? should you be starting? should he be starting? should we be starting? should you be starting? should they be starting?
Perfect	V-ing perfect
should I have started? should you have started? should he have started? should we have started? should you have started? should they have started?	should I have been starting? should you have been starting? should he have been starting? should we have been starting? should you have been starting? should they have been starting?

Interro-negative form

Simple form	V-ing form
should I not start? should you not start? should he not start? should we not start? should you not start? should they not start?	should I not be starting? should you not be starting? should he not be starting? should we not be starting? should you not be starting? should they not be starting?
Perfect	V-ing perfect
should I not have started? should you not have started? should he not have started? should we not have started? should you not have started? should they not have started?	should I not have been starting? should you not have been starting? should he not have been starting? should we not have been starting? should you not have been starting? should they not have been starting?