作业帮why couldn't they catch the 6:30train?Because they were dela
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why couldn't they catch the 6:30train?Because they were delayed by()
some heavy traffics,any heavy traffic,a heavy traffic,heavy traffic选哪个?
some heavy traffics,any heavy traffic,a heavy traffic,heavy traffic选哪个?
答案：heavy traffic
因为“ traffic”交通“时,为不可数名词,所以前面不能加不定冠词了.
再问： 可前面不是有形容词heavy 吗？有他不是可以加a吗？
再答： 即使不可数名词前有了修饰性的形容词，也不能用不定冠词。 不可数名词是指不能以数目来计算，不可以分成个体的概念、状态、品质、感情或表示物质材料的东 西；它一般没有复数形式，只有单数形式，它的前面不能用不定冠词a / an． 详情请参见：http://www.mofangge.com/html/qDetail/03/g3/201112/oqcjg303185869.html 希望你能切记它。
因为“ traffic”交通“时,为不可数名词,所以前面不能加不定冠词了.
再问： 可前面不是有形容词heavy 吗？有他不是可以加a吗？
再答： 即使不可数名词前有了修饰性的形容词，也不能用不定冠词。 不可数名词是指不能以数目来计算，不可以分成个体的概念、状态、品质、感情或表示物质材料的东 西；它一般没有复数形式，只有单数形式，它的前面不能用不定冠词a / an． 详情请参见：http://www.mofangge.com/html/qDetail/03/g3/201112/oqcjg303185869.html 希望你能切记它。
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