• Forms
    Should is a ‘modal auxiliary verb’. It has no -s in the third person singular.
      He should be here soon. (NOT He shouids . . .)
      Questions and negatives are made without do.
      Should we tell Judy? (NOT Do we should . . . ?)
      Should is followed by an infinitive without to.
      Should I go? (NOT Should I to go?)
  • Obligation
    We often use should to talk about obligation, duty and similar ideas.
      People should drive more carefully.
      You shouldn’t say things like that to Granny.

    Should I . . . ?is used to ask for advice, offer help or ask for instructions. (Like Shall I …? )

      Should I go and see the police, do you think?
      Should I help you with the washing up? What should I do?
  • Deduction
    We can use should to say that something is possible (because it is logical or normal).
      Henry should be here soon — he left home at six.
      ‘We’re spending the winter in Miami. ‘ ‘That should be nice. ‘
  • should have
    We can use [should + perfect infinitive] to talk about the past. This structure is used to talk about things which did not happen, or which may or may not have happened .
      [ should + have + past participle]
      I should have phoned Ed this morning, but I forgot.
      Ten o ‘clock: she should have arrived in her office by now.
  • Conditional
      Should/would is a conditional auxiliary .
      I should/would be very happy if I had nothing to do.