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16．Itmust have rained（一定是下雨了）last night，for the ground is very wet．

分析昨晚一定是下雨了，因為地面是濕的．

解答答案：must have rained．考查情態動詞的have done的形式．must have done表示"肯定做過某事"，是對過去動作的猜測．所以用must have rained表示"昨晚一定是下雨了"．

點評考查翻譯填空．
1．must+have done：用于肯定句，表示推測，意為"一定（已經）…"．
2．can+have done：用于否定句或疑問句，表示推測，意為"可能（已經）…"．
3．could+have done：可用于肯定句、否定句或疑問句，表示推測、責備或遺憾等，意為"可能…"、"本來可以…"、"本來應該…"等．
4．should[ought to]+have done：可用于肯定句、否定句或疑問句，表示責備或遺憾等，意為"本來應該…"．
5．need+have done：用于否定句或疑問句，用于否定時意為"本來不必"，用于疑問句時意為"有必要…嗎"．
6．may+have done：用于肯定句或否定句，表示推測，意為"可能（已經）…"．
7．might+have done：用于肯定句或否定句，表示推測，意為"可能（已經）…（此時 might 可換為 may）；另外還可以表示過來可能發生的事結果未發生，意為"本來會…"（此時 might 不能換為 may）．

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