Question 1

Why do we use которым instead of another form of который?

Accepted Answer

Который acts like an adjective, so it must match the gender and number of the noun it refers back to. Since молоток (hammer) is masculine and singular, we use the masculine singular form. The preposition с (meaning 'with') requires the Instrumental case, making it с которым.

Question 2

I learned that tools take the Instrumental case without с (like писать ручкой). Why is there a с here?

Accepted Answer

Excellent memory! You are right that tools typically take the bare Instrumental case to show the means of an action (so, молоток, которым ты работаешь is perfectly correct). However, adding с (работать с молотком) is very common in spoken Russian. It subtly shifts the feel from 'working by means of a hammer' to 'interacting with the hammer', but in casual speech, native speakers often use them interchangeably.

Question 3

Do I always need a comma before с которым in sentences like this?

Accepted Answer

Yes! Unlike English, where commas before 'which' or 'who' depend on whether the clause is defining or non-defining, Russian grammar strictly requires a comma before any relative clause (the part of the sentence starting with который, что, где, etc.).

Question 4

Could I put обычно at the end of the sentence?

Accepted Answer

Yes, because Russian word order is flexible, you could say ...с которым ты работаешь обычно?. However, placing an adverb of time or frequency like обычно (usually) directly before the verb it modifies (работаешь) is the most natural-sounding choice.

Где молоток, с которым ты обычно работаешь?

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