5．學(xué)生最好不要單獨下河游泳．
Studentshadbetternot go swimming alone in the river．

分析 had better．

解答 答案：had better．結(jié)合中英文，這里需要表達(dá)最好不要做某事，結(jié)合后面的not go用had better not do sth，故答案是had better．

點評 一、had better后面必須跟動詞原形．
had better后跟動詞原形（即不帶to的不定式），構(gòu)成had better do sth．句型．
這里的had不能用have來替換．如：
You'd better go to hospital at once．你最好立即去醫(yī)院看�。�
二、主語不論是第幾人稱，句子不論是什么時態(tài)，都要用had better的形式．如：
Now you（he，we） had better listen to the teacher．你（他，我們）現(xiàn)在最好聽老師講．

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