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　　　15

　　　　When you have had dinner with an American friend and want to leave, you may say： "Excuse me. I'll go first." (×)

　　　　When you have had dinner with an American friend and want to leave, you may say： "Excuse me. I have to go." (√)

　　　　[析] 这两句答语都是正确的，其关键不是语法，而是习惯问题。如果在这样的场合你讲 I'll go first. 朋友们会迷惑不解，而 I have to go则表示由于外界的特殊原因而造成的你要离去，而你本人则十分不愿做此事。

　　　　16

　　　　— Would you like to come to dinner tonight?

　　　　— I'd like to， and I'm too busy.(×)

　　　　— Would you like to come to dinner tonight?

　　　　— I'd like to， but I'm too busy.(√)

　　　　[析] I'm too busy与 I'd like to在意义上正好相反。所以要用转折连词。这里考查了对词义合乎逻辑的表达能力。所以要强调语言环境，更要强调在语言的基础上的词语辨析。