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flights是复数, there were ,但为什么单数名词后面要加a n ( a )?准确地说, there were estimated 45million flights ?

teacher

母语人士的回答

Rebecca

这是个好问题! A n是一个不定冠词。不定冠词是指未指定对象时在名词之前添加的冠词。 An estimated 48 millions flights ,因为我们不知道确切的An estimated 48 millions flights 。 There were estimated 48 million flights worldwide对于以英语为母语的人来说不是一个完整的句子,而且是一个非常尴尬的句子。这是不定冠词a的示例。例子: Could you please give me a book? (请给我本书吗?)例子: I need an honest opinion. ( I need an umbrella.诚实的意见。)例如: I need an umbrella. (我需要一把雨伞。)

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04/27

通过测验完成表达式!

2018年,全球估计有4500万次航班,