$*OwO:$

$-$ Câu tường thuật trần thuật: S + said + (to O) + (that) + S + V (Lùi thì).

  $+$ Chú ý: Với những động từ khuyết thiếu như "should, ought to" trong bài thì ta không lùi thì.

$-$ Câu tường thuật lời khuyên: S + advised + O + (not) + to V: Khuyên ai đó làm gì/ không làm gì.

$-$ "Mr. Robinson" là người nam, vậy khi thay đổi đại từ trong câu tường thuật, ta đổi "you" `->` "he".

$---$

$1.$ 

$-$ The doctor said to Mr. Robinson that he should take a few days off.

$-$ The doctor advised Mr. Robinson to take a few days off.

$2.$

$-$ The doctor said to Mr. Robinson that he should stay in bed for a few days.

$-$ The doctor advised Mr. Robinson to stay in bed for a few days.

$3.$

$-$ The doctor said to Mr. Robinson that he should take those medicines every four hours.

$-$ The doctor advised Mr. Robinson to take those medicines every four hours.

  $+$ Thay đổi từ: these `->` those.

$4.$

$-$ The doctor said to Mr. Robinson that he ought to keep his body warm.

$-$ The doctor advised Mr. Robinson to keep his body warm.

$5.$

$-$ The doctor said to Mr. Robinson that he shouldn't drink alcohol or smoke. 

$-$ The doctor advised Mr. Robinson not to drink alcohol or smoke.

$6.$

$-$ The doctor said to Mr. Robinson that he ought not to eat fatty food.

$-$ The doctor advised Mr. Robinson not to eat fatty food.

$7.$

$-$ The doctor said to Mr. Robinson that he should take a little milk before sleeping.

$-$ The doctor advised Mr. Robinson to take a little milk before sleeping.