4 sentences

1. 他们两国结成了紧密的同盟。

   tā​men liǎng guó jié​chéng le jǐn​mì de tóng​méng.

   The two countries formed a close alliance.

   Source: Dong Chinese Dictionary

2. 这几个民间组织决定结成一个环保联盟。

   zhè jǐ gè mín​jiān zǔ​zhī jué​dìng jié​chéng yī gè huán​bǎo lián​méng.

   These non-governmental organizations decided to form an environmental alliance.

   Source: Dong Chinese Dictionary

3. 这两个政党为了赢得选举而结成了政治联盟。

   zhè liǎng gè zhèng​dǎng wèi le yíng​dé xuǎn​jǔ ér jié​chéng le zhèng​zhì lián​méng.

   The two parties formed a political alliance to win the election.

   Source: Dong Chinese Dictionary

4. 水结成了冰。

   shuǐ jié​chéng le bīng.

   The water froze into ice.

   Source: Dong Chinese Dictionary