SHOULD/ SHOUND´N 

: We use should and shouldn't to give advice or to talk about what we think is right or wrong.
You should means something like I think it is a good idea for you to do it.
You shouldn't means something like I think it is a bad idea for you to do it.
Should is used to express the opinion of a speaker and often follows I think or I don't think.

Examples
  -You look tired. I think you should take a few days off.

  -Alice works very long hours. She should to talk to her boss.

   - I have an English test tomorrow.
   - I shouldn't worry if I were you. You have worked really hard.

   - I never have enough money.
   - I don't think you should go out so much.

 Negative
Te orden is:

Subjet + verb in simple form+ shouldn't + complement

Afirmative
The orden is:
Subjet +verb in simple form+ should + complement