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Questions & Answers about Утро было холодное.
Why is the word for 'was' было and not был?
In the past tense, Russian verbs must match the gender of the subject. The word for morning, утро, is a neuter noun because it ends in -о. Therefore, the verb takes the neuter past tense form было. If the subject were masculine, you would use был.
Why does the adjective холодное end in -ое?
Adjectives also have to match the gender of the noun they describe. Because утро is neuter, the adjective takes the neuter ending -ое. If you were talking about a masculine noun like день (day), it would be холодный.
How can I add a word like 'yesterday' to this sentence?
You can just put вчера (yesterday) at the start or end of the sentence! Because Russian word order is flexible, Вчера утро было холодное and Утро было холодное вчера both perfectly mean 'Yesterday morning was cold'.