Learn Dutch: Zij is boos op haar broer. - She is angry with her brother.

In Dutch, the adjective boos (angry) takes the fixed preposition op when you are angry at or with someone. Prepositions rarely translate directly between languages, so it is best to learn them as a pair: boos op (angry with/at).

Can I use boos op if I am angry about a situation instead of a person?

Usually, no. If you are angry about a situation, event, or thing, you use the preposition over instead. For example: Zij is boos over het nieuws (She is angry about the news). You use op specifically when the anger is directed at a person or an animal.

Could I use ze instead of zij in this sentence?

Yes, you can! Zij is the stressed form of 'she', and ze is the unstressed form. You use zij when you want to emphasize that she is the one who is angry, rather than someone else. If there is no special emphasis needed, ze is perfectly fine and actually more common in casual speech.

Does the word haar change depending on the gender of broer?