I should lock you should lock he should lock we should lock you should lock they should lock
V-ing form
I should be locking you should be locking he should be locking we should be locking you should be locking they should be locking
Perfect
I should have locked you should have locked he should have locked we should have locked you should have locked they should have locked
V-ing perfect
I should have been locking you should have been locking he should have been locking we should have been locking you should have been locking they should have been locking
Negation
Simple form
I should not lock you should not lock he should not lock we should not lock you should not lock they should not lock
V-ing form
I should not be locking you should not be locking he should not be locking we should not be locking you should not be locking they should not be locking
Perfect
I should not have locked you should not have locked he should not have locked we should not have locked you should not have locked they should not have locked
V-ing perfect
I should not have been locking you should not have been locking he should not have been locking we should not have been locking you should not have been locking they should not have been locking
Interrogative form
Simple form
should I lock? should you lock? should he lock? should we lock? should you lock? should they lock?
V-ing form
should I be locking? should you be locking? should he be locking? should we be locking? should you be locking? should they be locking?
Perfect
should I have locked? should you have locked? should he have locked? should we have locked? should you have locked? should they have locked?
V-ing perfect
should I have been locking? should you have been locking? should he have been locking? should we have been locking? should you have been locking? should they have been locking?
Interro-negative form
Simple form
should I not lock? should you not lock? should he not lock? should we not lock? should you not lock? should they not lock?
V-ing form
should I not be locking? should you not be locking? should he not be locking? should we not be locking? should you not be locking? should they not be locking?
Perfect
should I not have locked? should you not have locked? should he not have locked? should we not have locked? should you not have locked? should they not have locked?
V-ing perfect
should I not have been locking? should you not have been locking? should he not have been locking? should we not have been locking? should you not have been locking? should they not have been locking?