The phrasal verb "believe in" is widely used in both informal and formal contexts, though its tone is often more suited to personal or philosophical discussions as opposed to academic or highly technical settings. It's commonly employed when discussing faith, trust, or confidence in concepts, people, or entities, such as believing in someone's potential or in the existence of an entity like a deity. "Believe in" can refer to holding a conviction about the goodness or truth of something or someone, and is also used to express trust or support, as in "I believe in you." The verb is versatile, allowing it to fit a range of sentences from casual conversations to formal speeches addressing values and beliefs. The importance of "believe in" lies in its reflection of not only personal faith but also broader ideological or moral support.
B1
PreIntermediate
1. To have faith or confidence in the existence or truth of something, such as a deity, a principle, or an idea.
Many people believe in the existence of extraterrestrial life.
She believes in the principle of equal rights for all individuals.
2. To have trust or confidence in someone's abilities or character.
I believe in my friend's capability to succeed.
The coach believes in her players, motivating them to give their best performance.