Either you or I am right.

　　判斷改錯(cuò)：

　　(錯(cuò)) They sat down and talk about something.

　　(錯(cuò)) They started to dance and sang.

　　(錯(cuò)) I saw two men sitting behind and whisper there.

　　(對(duì)) They sat down and talked about something.

　　(對(duì)) They started to dance and sing.

　　(對(duì))I saw two men sitting behind and whispering there.

　　解析：

　　第一句： and 連接兩個(gè)并列的謂語(yǔ)，所以 talk 應(yīng)改為 talked。

　　第二句：and 連接兩個(gè)并列的動(dòng)詞不定式，第二個(gè)不定式往往省略to，因此sang 應(yīng)改為 sing。

　　第三句：and 連接感觀動(dòng)詞saw 后面的用作的賓補(bǔ)的兩個(gè)并列分詞結(jié)構(gòu)，因此whisper應(yīng)改為whispering。

　　注意：and 還可以和祈使句或名詞詞組連用表示條件。（or也有此用法）

　　Make up your mind, and you'll get the chance.

　　= If you make up your mind, you'll get the chance.

　　One more effort, and you'll succeed.

　　= If you make one more effort, you'll succeed.

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