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Добрый день, это моя сестра.

Добрый день, это моя сестра.
Good afternoon, this is my sister.
From Lesson 12:Greetings and goodbyes (здравствуйте, привет)·Russian

Questions & Answers about Добрый день, это моя сестра.

Why do we use это when talking about a feminine sister?
When you introduce someone or something by saying "This is...", you always use the invariant word это, regardless of the gender or number of the noun that follows. You don't change it to match the feminine word сестра.
Where is the word for "is" in this sentence?
Russian drops the verb "to be" in the present tense. Instead of saying "This is my sister", you simply say "This my sister" (это моя сестра).
Why does Добрый end in -ый here?
It is a masculine adjective matching the masculine noun день (day). Nouns ending in a soft sign (-ь) can be tricky because they can be either masculine or feminine, so you just have to remember that день is masculine.
Why is the word for "my" spelled моя here?
In Russian, possessive words like "my" must match the gender of the noun they belong to. Since сестра (sister) is feminine, you must use the feminine form моя instead of the masculine form мой.

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