English grammar rule A uncountable

Rule Frequency
In Top 100 rules

You can only use the indefinite article with singular, countable nouns. Definite articles must be used with uncountable nouns, but always in the singular form (this, that). Also, don’t use a or an with any other determiner. .

Examples of 'A uncountable' rule
  1. Incorrect You have already received a that book.
    Correct You have already received that book.
    Incorrect Jennifer spent time in a traffic this morning.
    Correct Jennifer spent time in traffic this morning.
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