это книга

this is a book

→ это

phrase Uncommon #19,343

this is a book In Russian, это stays the same before singular and plural nouns; the noun changes to match the number.

RU: Это книга моей сестры.

EN: This is my sister’s book.

This is Tom's book.

This is a book.

This is my wife’s book.

— Охота за «Красным Октябрем» (1990)

This is Ali's book.

phrase Rare #39,437

this is a book Depending on context, это книга can also mean “this book,” as in a question about whose book it is.

RU: Это книга моего брата.

EN: This is my brother’s book.

This is a book for Aunt Lucy!

— Приключения Паддингтона 2 (2017)

This is a book about animals.

Yes, this is a book, my dear.

— Однажды в… Голливуде (2019)