Breakdown of Я на всякий случай взял его номер.
он
he / it (for a masculine noun) / it (for a neuter noun)
я
I
взять
to take / to adopt
номер
number (phone, room)
на всякий случай
just in case
Questions & Answers about Я на всякий случай взял его номер.
Why do we use на всякий случай here instead of the в случае structure from this lesson?
The phrase на всякий случай is a fixed idiom meaning "just in case" (as a general precaution). The structure в случае that you are currently studying means "in the event of [something specific]" and must be followed by a Genitive noun (like в случае дождя meaning "in case of rain") or a conditional clause. Because this sentence doesn't specify exactly what might happen, we use the idiom with на rather than the contingent structure with в.
What case is всякий случай in, and why?
It is in the Accusative case. While the preposition на often takes the Prepositional case to indicate location, it takes the Accusative when indicating purpose, direction, or a time limit. In this fixed expression, the Accusative is used to show the abstract purpose of the action.
Does взял here imply taking a physical piece of paper with the number on it?
Not necessarily. Just like in English, the phrase взять номер is the standard, natural way to say you got or recorded someone's phone number. It is usually abstract and simply means saving it in your phone.
Could I place на всякий случай at the very end of the sentence?
Yes, you could say Я взял его номер на всякий случай. Russian word order is flexible, but placing the adverbial phrase before the verb, as in this sentence, is very natural and subtly emphasizes the precautionary motivation right before stating the action itself.
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