3 sentences

1. 孩子们正在公园里荡秋千。

   hái​zi​men zhèng​zài gōng​yuán lǐ dàng qiū​qiān.

   The children are playing on the swings in the park.

   Source: Dong Chinese Dictionary

2. 他在公园的长椅后面悠闲地荡着秋千。

   tā zài gōng​yuán de cháng​yǐ hòu​mian yōu​xián de dàng zhe qiū​qiān.

   He was leisurely swinging on a swing behind the park bench.

   Source: Dong Chinese Dictionary

3. 院子里的那架秋千是爷爷亲手为我做的。

   yuàn​zi lǐ de nà jià qiū​qiān shì yé​ye qīn​shǒu wèi wǒ zuò de.

   The swing in the yard was made for me by my grandfather with his own hands.

   Source: Dong Chinese Dictionary