English Grammar: The Use of Should in English Language

   Should is an auxiliary verb in English grammar and we may  use should for the following reasons:

•   To give an advice or a suggestion
•   To tell someone  about his duty or obligation

  Affirmative Statement 

  Structure:
  Subject + [should + 1st form of verb] + Object
  Examples:
  We should respect our parents.
  People should work together for the progress of their country.
  President Obama should take interest in the public affairs.
  Police should arrest the criminals red handed.
  You should work down to dusk for your new business.
  Negative:
  Subject + [should not + 1st form of verb] + Object
 We should not respect our parents.
  People should not work together for the progress of their country.
  President Obama should not take interest in the public affairs.
  Police should not arrest the criminals red handed.
  You should not work down to dusk for your old business.
Interrogative:
  Should + Subject + [ 1st form of verb] + Object
  Should we respect our parents?
  Should people work together for the progress of their country?
  Should President Obama take interest in the public affairs?
  Should police arrest the criminals red handed?
  Should you work down to dusk for your old business?