The girl laughed happily with her friends.
Meaning: This sentence describes a girl who is making sounds expressing joy while she is with people she knows well and likes.
Choice of Words: Girl is a young female child. Laughed means to make a sound expressing amusement or joy. Happily means with great happiness or delight. With means in the company of. Friends are people who you know well and like a lot.
Alternative Expressions
Related Expressions