| Form | subject + should + base verb; one form for every subject | You should see a doctor. |
| Negative | shouldn't; no do | You shouldn't work so late. |
| Question | Should + subject + base verb; no do | Should I take the bus? / What should I do? |
| Advice | should for a good idea, shouldn't for a bad one | You should drink more water. / You shouldn't eat so much sugar. |
| Opinion | what you think is right or good | I think the government should build more parks. |
| Should or must | should: advice or a mild duty; must: a strong obligation or a rule | You should wear a coat. / You must wear a seat belt. |
| Trap | a negative opinion puts don't on think | I don't think you should go. |