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Everybody has an obligation to keep our city clean.
网校学员luc**在学习新概念英语2、3、4册连读【双11专享班】时提出了此问题，已有1人帮助了TA。
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清醒季smile
同学你好，该知识点来自沪江网校《新概念英语2、3、4册连读【双11专享班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。
同学你好~一般将不定式修饰名词的情况都视为不定式作定语，只不过不定式作定语的时候，可以表示同位关系，所以这两个其实是一回事。
to keep our city clean可以看作不定式作定语，表示同位关系。
祝同学学习进步~
版权申明：知识和讨论来自课程：《新概念英语2、3、4册连读【双11专享班】》的学员和老师，如果想了解更多，可以报名参加课程学习。所有知识讨论内容，版权归作者及沪江网校所有。
新概念英语2、3、4册连读【双11专享班】
已有43人在本课程中发现了3302个知识
已有3012个知识得到了老师的回复
本课程热门知识点
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- there was a great deal of excitement just before it began 在某事开始之前，有大量的兴奋 这里翻译不通啊
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- 请问情态动词 would 和could以及might 可以表示过去式吗？