should

past tense of shall

1 —used in auxiliary function to express condition if he should leave his father, his father would die — Genesis 44:22 (Revised Standard Version)

2 —used in auxiliary function to express obligation, propriety, or expediency 'tis commanded I should do so — William Shakespeare this is as it should be — H. L. Savage you should brush your teeth after each meal

3 —used in auxiliary function to express futurity from a point of view in the past realized that she should have to do most of her farm work before sunrise — Ellen Glasgow

4 —used in auxiliary function to express what is probable or expected with an early start, they should be here by noon

5 —used in auxiliary function to express a request in a polite manner or to soften direct statement I should suggest that a guide … is the first essential — L. D. Reddick