write + because of
kaku sei de
because of; on account of — blaming an unwanted result on N
電車が遅れたせいで、遅刻しちゃった。
densha ga okureta sei de, chikoku shichatta.
Because the train was late, I ended up being late. casual
天気が悪かったせいで、試合は中止になった。
tenki ga warukatta sei de, shiai wa chuushi ni natta.
Because the weather was bad, the match was called off. neutral