由于...

You usually place 由于 at the very beginning of a sentence. It introduces the reason first. Then, you follow up with the result. Often, you'll see it paired with 所以 (so) or 因此 (therefore). For example: 由于 [Reason], 所以 [Result]. It’s like building a bridge from the cause to the outcome. Keep your sentences crisp. Don't bury the lead!

Use this when you want to sound clear and organized. It’s perfect for work emails or explaining a delay. It works great when you're giving a speech. Use it when writing a report or a formal letter. It’s also common in news broadcasts. If you want to sound like you've really thought things through, this is your word. It’s the 'adulting' version of explaining yourself.

Avoid using it in super casual settings. Don't use it while shouting to a friend across a loud bar. If you're just telling your mom you're hungry, stick to 因为. Using 由于 there might make you sound like a robot or a textbook. It’s a bit too 'stiff' for pillow talk or joking around with toddlers. If the reason is tiny or trivial, it might feel too heavy.

In Chinese culture, logic and sequence are highly valued in formal communication. 由于 reflects a traditional preference for stating the context before the conclusion. It shows respect for the listener's intelligence. It suggests that the speaker is objective and rational. It’s a staple of 'Written Chinese' (书面语), which has deep roots in classical literature. Using it correctly shows you have a good grasp of formal social etiquette.

You might hear 因为 in daily life most often. For a very formal vibe, you might see 鉴于 (in light of). If you want to be even more concise in writing, sometimes just 由 is used. But for your B1 level, 由于 is the perfect middle ground. It’s sophisticated but still very accessible. It’s like the 'business casual' of Chinese grammar.