2 sentences

1. 课间休息时，同学们都跑到操场上玩耍。

   kè​jiān xiū​xi shí, tóng​xué men dōu pǎo dào cāo​chǎng shàng wán​shuǎ.

   During recess, the students all ran to the playground to play.

   Source: Dong Chinese Dictionary

2. 课间休息时，几个孩子在操场上开心地玩丢沙包。

   kè​jiān xiū​xi shí, jǐ gè hái​zi zài cāo​chǎng shàng kāi​xīn de wán diū shā​bāo.

   During recess, several children were happily playing beanbag toss on the playground.

   Source: Dong Chinese Dictionary