• 2022-05-31
    中国大学MOOC: Pure vowels can be classified into three categories: front vowels, central vowels and back vowels. The two vowels/ɜː/ and /ə/ are classified into ______ vowels because they are made with the middle part of the tongue being raised.
  • central

    内容

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      中国大学MOOC:" In the following groups of vowels, are not all front vowels.";

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      中国大学MOOC: There are two central vowels in English. What are they?

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      中国大学MOOC: There are ______ pure vowels and ______ diphthongs in English.

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      中国大学MOOC:"In the following groups of vowels, are mid vowels.";

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      There are ______ pure vowels in English.