Иван должен покупать продукты и убирать квартиру.

Questions & Answers about Иван должен покупать продукты и убирать квартиру.

How does должен work in this sentence?
должен means "must" or "has to", but it behaves like an adjective in Russian. It has to agree with the subject in gender and number. Since Иван is a masculine subject, we use the masculine form должен. If the subject were a woman, it would be должна.
Does должен apply to both actions?
Yes! You can use one должен followed by multiple infinitive verbs connected by и (and). Ivan "must buy" and "[must] clean".
Why are the verbs покупать and убирать in their imperfective forms?
Using the imperfective verbs (покупать instead of купить, and убирать instead of убрать) shows that this is a regular, repeated obligation. These are Ivan's ongoing chores, not just a one-time task he must complete.
Why does квартира change to квартиру, but продукты doesn't change?
Both are in the accusative case because they are the direct objects of the verbs. The feminine singular noun квартира changes its ending to квартиру. However, продукты is an inanimate plural noun, and in the accusative case, inanimate plurals keep their original dictionary form.

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