You have a cold. You should ____ some hot tea.
- A. drink(correct answer)
- B. to drink
- C. drinks
- D. drinking
Why: After should, use the base verb: no to, no -s, no -ing. Can works the same way.
A212 questions · Elementary · Modal Verbs and Related Expressions
Give and ask for advice: should and shouldn't with the base verb, Should I…? and What should I…?, the gentle I don't think you should, and when must fits better. Answers explained.

1.You have a cold. You should ____ some hot tea.
Why: After should, use the base verb: no to, no -s, no -ing. Can works the same way.
2.____ a suit to the wedding?
Why: To ask for advice, put should in front of the subject. No do, and wear stays as it is.
3.You ____ leave your bag here. It isn't safe.
Why: The negative of should is shouldn't. No to after it.
How to give advice with should and shouldn't: the base verb after should, Should I…? questions, I don't think you should, and the difference from must.