Friends play happily in playground.

Meaning: This sentence describes friends enjoying themselves in a place meant for playing. It's like saying, The people who like each other were engaging in an enjoyable activity in an area meant for children to play.

Choice of Words: Friends are people who like each other and spend time together. "Play" means to engage in an activity for enjoyment. "Happily" means with great joy or delight. "Playground" is an area where children can play.

Alternative Expressions

Related Expressions