The note when using pronouns (Who, Which, Whom ....)1. When to use a comma? When noun stands in front of the who, whom, which ... is:• Noun, name: Ha Noi, which ... Mary, who is ...• Is this, that, these, those that precede the noun: = > This book, which ...• Ownership: = > noun stands in front of My mother, who is. ..• Is the only character who also said: (the Sun (the Sun), moon (Moon) = > The Sun, which ...
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