Proveravam dasku libelom i merim je mernom trakom.

I check the board with a spirit level and measure it with a tape.

Breakdown of Proveravam dasku libelom i merim je mernom trakom.

• i: and
• je: it
• proveriti: to check
• meriti: to measure

Questions & Answers about Proveravam dasku libelom i merim je mernom trakom.

Why is daska written as dasku here?

Because dasku is in the accusative case, which marks the direct object of the verb.

In this sentence, the thing being checked is the board/plank, so Serbian uses the accusative:

• daska = board, plank (dictionary form / nominative)
• dasku = board, plank (accusative singular)

So:

• Proveravam dasku = I am checking the board

This is very common with feminine nouns ending in -a:

• nominative: kuća
• accusative: kuću

The same pattern gives:

• daska → dasku

Why are libelom and mernom trakom in that form?

They are in the instrumental case, which is often used to show the tool, means, or instrument used to do something.

So here:

• libelom = with a level
• mernom trakom = with a measuring tape

The sentence is saying:

• I check the board using a level
• I measure it using a measuring tape

For feminine singular nouns, the instrumental often ends in -om:

• libela → libelom
• traka → trakom

And the adjective has to match the noun:

• merna traka = measuring tape
• mernom trakom = with a measuring tape

Do I need a word for with before or ?