Breakdown of Ежедневно кабина должна быть вымыта и проверена.
и
and
быть
to be
мыть
to wash
должен
must, have to (должен, должна, должны)
проверить
to check (perfective)
ежедневно
daily (adverb, every day)
кабина
the cabin
Questions & Answers about Ежедневно кабина должна быть вымыта и проверена.
Why do we use вымыта and проверена instead of their full forms?
In Russian, when a passive participle functions as the main action happening to the subject (the predicate), we use the short form. Combined with должна быть, the short forms вымыта and проверена express what must be done to the cabin. Full forms are typically used as adjectives directly modifying a noun within a phrase, like a 'washed cabin'.
How does agreement work in the phrase должна быть вымыта и проверена?
The modal word должна and the short passive participles вымыта and проверена must all agree in gender and number with the subject, кабина. Because кабина is a feminine singular noun, all three of those words take the feminine singular ending -а. The infinitive быть acts as a bridge and stays the same.
Why are the participles perfective (вымыта, проверена) if this is a daily (ежедневно) routine?
This is a great catch! Usually, repeated actions use imperfective verbs. However, in passive constructions focused on achieving a specific state or result (the cabin must reach the state of being completely clean and fully checked), Russian strongly prefers perfective participles, even if that end result needs to be achieved repeatedly.
Is it possible to drop быть and just say кабина должна вымыта?
No, быть is strictly required here. While the present tense of 'to be' is often dropped in simple Russian sentences, you cannot directly link a modal word like должен to a short participle. The infinitive быть is necessary to hold the construction together.
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