2 sentences

1. 师兄在学业上给了我很多指导。

   shī​xiōng zài xué​yè shàng gěi le wǒ hěn​duō zhǐ​dǎo.

   My senior fellow student gave me a lot of guidance in my studies.

   Source: Dong Chinese Dictionary

2. 老师的儿子比我大几岁，我一直称呼他为师兄。

   lǎo​shī de ér​zi bǐ wǒ dà jǐ suì, wǒ yī​zhí chēng​hu tā wéi shī​xiōng.

   The teacher's son is a few years older than me, so I've always called him 'shixiong'.

   Source: Dong Chinese Dictionary