Today we're dealing with an interesting topic. In the last paragraph of this post I mentioned, that a noun in the nominative can be a subject (actually, the subject of a sentence is always in the nominative) or a part of a noun predicate. However, the noun part of the predicate is not necessarily in the nominative. Let's see how it works.
If you're a businessman, you can just say "Я бизнесмен" (as you may remember, in such case we usually drop the linking verb "есть"), so both the subject (the personal pronoun "я") and the noun part of the predicate ("бизнесмен"). However, if you were a businessman (and now you're not), you need the instrumental case: "Я был бизнесменом". Also, let's imagine you have a son who wants to be a businessman too. He will then say, "Я буду бизнесменом". Alternatively, he may say, "Когда я вырасту, я стану бизнесменом" (here we also use the instrumental case).
When writing, let's say, a scientific paper or an article for a magazine, you may also use one of the following constructions:
"Глобальное потепление является серьёзной проблемой" (Nominative является instrumental).
"Глобальное потепление представляет собой серьёзную проблему" (Nominative представляет собой accusative).
What else can we learn using these two examples? Well, here I will just briefly mention one of the most important rules (later on we will discuss it in more detail): an adjective should be in the same case, gender and number as the noun this adjective is related to. Sounds simple, doesn't it? For example, here the noun "потепление" is singular, neuter and (in both cases) in the nominative case, so the adjective "глобальное" has the same parameters.
So, that's all for today. Next time we will be talking about the questions the nouns in different cases answer to. I will also give you some learning tips which you may use learning the cases or any other material. Не пропустите! ;)
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