3 sentences

1. 最近天气有些反常。

   zuì​jìn tiān​qì yǒu​xiē fǎn​cháng.

   The weather has been a bit unusual lately.

   Source: Dong Chinese Dictionary

2. 这种反常的天气预兆着风暴的来临。

   zhè zhǒng fǎn​cháng de tiān​qì yù​zhào zhe fēng​bào de lái​lín.

   This unusual weather portends the arrival of a storm.

   Source: Dong Chinese Dictionary

3. 他这种反常的举动引起了保安的注意。

   tā zhè zhǒng fǎn​cháng de jǔ​dòng yǐn​qǐ le bǎo'ān de zhù​yì.

   His unusual behavior caught the security guard's attention.

   Source: Dong Chinese Dictionary