Breakdown of Ponieważ był strajk, nasz dyrektor odwołał spotkanie.
być
to be
nasz
our
dyrektor
director
spotkanie
meeting (n)
Questions & Answers about Ponieważ był strajk, nasz dyrektor odwołał spotkanie.
Could I use bo instead of ponieważ at the beginning of this sentence?
Usually, no. While bo and ponieważ both mean "because" or "since", bo is highly colloquial and sounds unnatural at the absolute beginning of a sentence. When you want to start a sentence with the cause, ponieważ is the standard, correct choice.
Why is it był strajk rather than the generic było strajk?
The verb "to be" must agree with the gender of the subject. The noun strajk (strike) is masculine, so it takes the masculine past tense form był. You would only use było for neuter nouns (like było spotkanie) or in impersonal phrases.
Why is the verb odwołał used here instead of its imperfective pair odwoływał?
The director cancelled the meeting as a single, completed action with a clear result. The perfective verb odwołał shows this completion. If you used the imperfective odwoływał, it would mean he "was cancelling" it (an unfinished process) or repeatedly cancelled it over time.
What case is spotkanie in here, and why doesn't its ending change?
It is in the accusative case, because it is the direct object being acted upon (he cancelled what? the meeting). However, spotkanie is a neuter noun, and for neuter nouns, the accusative form is exactly the same as the dictionary (nominative) form.