"Frightening" in English can be used to describe something that makes people feel scared or intimidated. Here are some examples:
1. The sight of the big, black dog running towards him was frightening.
2. The thunder and lightning during the storm was frightening.
3. The look on his face when he found out he failed the exam was frightening.
4. The thought of facing the crowds at the shopping centre was frightening for her.
5. The sight of the blood and guts splattered across the walls in the horror movie was frightening.
Note that "frightening" can also be used to describe someone or something that is extremely intimidating or scary, as well as something that is naturally scary, such as a wild animal or a dark, empty place.