Can Should

Can
"Can" is one of the most commonly used modal verbs in English. It can be used to express ability or opportunity, to request or offer permission, and to show possibility or impossibility.

Examples:

•I can ride a horse. ability
•We can stay with my brother when we are in Paris. opportunity
•She cannot stay out after 10 PM. permission
•Can you hand me the stapler? request
•Any child can grow up to be president. possibility

Should
"Should" is most commonly used to make recommendations or give advice. It can also be used to express obligation as well as expectation.

Examples:

•When you go to Berlin, you should visit the palaces in Potsdam. recommendation
•You should focus more on your family and less on work. advice
•I really should be in the office by 7:00 AM. obligation
•By now, they should already be in Dubai. expectation