Mexican in Gringolandia

Should is used to give advice
- You Should do your homework

with all the people and not change the shape

I you affirmation
he,she,we,they it + should + infinitive without to
Example: He should work harder

Shouldn't
This is a shape of negation
I,you,he, she,we, they, It + should`t + infinitive without to
Example: We Shouldn't arrive late

For questions
Should + subject + verb + infinitive without to
Example: Should I study this chapter for the exam?

For Answers
Yes, you should
No, you Shouldn't