-Can't you make any good friends if youaren't polite enough?-I must make the change．题目和参考答案——青夏教育精英家教网—

4．-Can't you make any good friends if youaren't（not be） polite enough？
-I must make the change．

分析如果你不够礼貌，难道就不能交到好朋友吗？
--我必须做出改变．

解答答案：aren't．
根据Can't you make any good friends if you--（not be） polite enough，可知如果你不够礼貌，难道就不能交到好朋友吗？这里if引导的条件状语从句，主句是can't引导的句子，从句应该用一般现在时．故填aren't．

点评单词填空类型题要充分理解句意，再根据单词提示完成试题，注意时态，单复数，词性等变化．

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