✔ 最佳答案
Your classmate is sick. Advise him to see a doctor. (ought to)
You ought to see a doctor as you are sick.
2) Your friend has a small flat. He wants to buy a dog. Advise him not to. (should)
You should not buy (I prefer to use the word "own" rather than "buy") a dog as your flat is small.
3) It is raining. Advise your classmate not to play football. (should)
You should not play football as it is raining.
Your friend is very kind and caring. Advise him to become a nurse. (why not)
You are very kind and caring, why don't you become a nurse?
5) Your classmate has a test next week. Advise her not to be lazy. (ought to)
You ought not to be lazy as you will have a test next week.