They don't know how to be strong AND brave - these qualities are combined into one overall thing They don't know how to be strong OR brave - these are two distinct qualities. They don't know how to be strong. They also don't know how to be brave. For example, I don't like chocolate and orange means that I don't like chocolate and orange together in combination. I don't like chocolate or orange means that I don't like chocolate and I also don't like orange.

Both ways are perfectly fine.

Filip and Claire are correct. "And" and "or" have precise logical meanings. "And" means both are true. "Or" means at least one is true. If you want to specify that exactly one is true, you have to change the wording: "They are strong or brave, but not both."

Both "and" and "or" can be correct in this sentence, depending on what you want to express: 1. "They don't know how to be strong and brave." - This means they don't know how to be both strong and brave at the same time. It implies they lack knowledge or ability to embody both qualities together. 2. "They don't know how to be strong or brave." - This means they don't know how to be either strong or brave individually. It implies they lack the ability to embody either of these qualities. Key Difference: - Use "and" if you mean both together. - Use "or" if you mean either one or the other. In negative sentences, "or" is more common when listing alternatives, but both are grammatically correct depending on the intended meaning 😉