Breakdown of Мы наняли его в качестве стажёра.
мы
we
в
in / to (direction)
его
him / it (acc)
нанять
to hire (perf)
Questions & Answers about Мы наняли его в качестве стажёра.
Why do we use в качестве here instead of just как?
В качестве literally means 'in the quality of' or 'in the capacity of'. It sounds a bit more formal and official than как, making it the natural choice for a professional context like hiring someone.
What case is стажёра in after в качестве?
It is in the Genitive case. The set phrase в качестве always requires the noun that follows it to be in the Genitive case, regardless of the rest of the sentence.
If I used как instead, would the ending of стажёра change?
No, but the grammatical reason changes! If you say Мы наняли его как стажёра, the word after как must match the case of the word it refers to. It refers to его (Accusative). Because стажёр is an animate masculine noun, its Accusative form is стажёра—which happens to look exactly like the Genitive form used after в качестве.
What is the infinitive of the verb наняли?
The infinitive is нанять (to hire). It is a perfective verb, indicating the completed action of bringing him on board. Its imperfective counterpart is нанимать.