从方框中选择适当的单词或短语并用其适当形式填空。
stay at home flu season should
exercise every day enough sleep if
① It is now. We must be careful.
② You eat healthy food to stay healthy.
③ — I feel tired.
— You should get .
④ Mike is ill. He has to .
⑤ you don't feel well, see a doctor.
⑥ We should and drink enough water.

① flu season
② should
③ enough sleep
④ stay at home
⑤ If
⑥ exercise every day

情态动词should的用法
should意为“应该”，为情态动词，后面跟动词原形，没有人称和数的变化。

练一练
（）① You brush your teeth twice a day.
A. should B. is C. are
（）② He go to bed late on school nights.
A. shouldn’t B. am C. be
③ They should help their parents at home.（改为否定句）
They their parents at home.
④ 根据中文意思，补全句子。
你不应该在课堂上吃东西。
You eat in class.

① A
② A
③ shouldn't help
④ shouldn't