Breakdown of Начало урока было интересным.
быть
to be
интересный
interesting
урок
the lesson
начало
the beginning
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Questions & Answers about Начало урока было интересным.
What gender and case is the noun начало in “Начало урока было интересным.”?
Начало ends in -о, so it’s a neuter noun. It stands in the nominative singular case because it’s the subject (“the beginning”).
Why is урока in the genitive case and what does it indicate?
Урока is the genitive singular of урок. Here it shows a “of…” relationship: начало (чего?) урока – “the beginning of the lesson.”
Why is the verb было used instead of есть (“to be”)?
Было is the past-tense form of быть. Since the sentence refers to the past, you must use было. In the present tense Russian normally omits есть altogether.
Why does было end in -о (neuter)?
In Russian past tense, the verb быть agrees with the subject in gender and number. Because начало is neuter singular, the correct form is было.
Why is the adjective интересным in the instrumental case rather than the nominative?
With past (and future) forms of быть, predicative adjectives take the instrumental case. So the nominative интересный changes to the instrumental интересным to describe the subject.
Could we say “Начало урока было интересное” instead?
No. After быть in past or future, the predicate adjective must be in the instrumental case (интересным). Using the nominative (интересное) here would be grammatically incorrect.
Can we drop the verb было and say “Начало урока интересно”?
Yes, but this becomes a present-tense or impersonal construction meaning “The beginning of the lesson is interesting” or more literally “It is interesting at the beginning of the lesson.” In past tense you need было plus the instrumental adjective.
How would you express “The beginning of the lesson is interesting” in the present tense?
You’d drop быть and use the short-form predicate: Начало урока интересно. Here интересно is the neuter short adjective used predicatively.
How would the sentence change if you talk about “the end” instead of “the beginning”?
Replace начало (neuter) with конец (masculine). The sentence becomes Конец урока был интересным. Note that был is the masculine past form of быть.