Should is commonly used to give advice.

  • You should go see a doctor.
  • They shouldn’t stay up too late.

Should can also be used to describe what someone is expected to do.

  • I should study harder.
  • You should smile in pictures.
  • They should not dress like that.

Should can also be used to describe what is supposed to happen in the future.

  • It should rain tomorrow. (According to the weather forecast, it’s supposed to rain tomorrow.)