poniewieża

In a sentence

• Nie mogłem przyjść na spotkanie, poniewież byłem chory.

  I couldn't come to the meeting because I was sick.

  Here, 'poniewież' is used as a causal conjunction connecting the reason for not attending the meeting.

• Powiedział mi to, poniewież uważał, że jest to ważne.

  He told me this because he thought it was important.

  In this sentence, 'poniewież' works to specify the motivation behind the action performed by the subject.

• Poniewież jest tak późno, zrezygnujemy z tej wycieczki.

  Because it is so late, we will cancel this trip.

  Here, 'poniewież' introduces a temporal consequence acting upon the circumstance described.