Моя работа была интересной.

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Breakdown of Моя работа была интересной.

• быть: to be
• работа: the work
• интересный: interesting

Questions & Answers about Моя работа была интересной.

Why is интересной in the instrumental case rather than the nominative form интересная?

In Russian, when an adjective functions as the predicate complement after the past tense of «быть» (to be), it is usually placed in the instrumental case. Here, была serves as the copula linking the subject работа (in the nominative) with its characteristic. Thus, интересной is the instrumental feminine singular form of интересный, required by this construction.

How does the past tense of «быть» operate in this sentence?

The word была is the past tense form of the verb «быть» and is used as the linking verb (copula) between the subject and its predicate. Unlike the present tense—where the verb «быть» is often omitted—the past tense requires an explicit form. Because работа is a feminine noun, the correct form is была.

Why do the adjective and the subject appear in different cases?

The subject работа is in the nominative case, and its possessive modifier моя is also in the nominative feminine singular. However, when an adjective is used as a predicate after the copula (in the past or future tenses), it is expected to take the instrumental case. This is why интересной is used instead of the nominative интересная.

What is the role of the instrumental case in the predicate adjective?