Usages of gēge
我 哥哥 已经 工作 了， 妹妹 还 在 学校 学习。Wǒ gēge yǐjīng gōngzuò le, mèimei hái zài xuéxiào xuéxí.
My older brother is already working; my younger sister is still studying at school.
周末 我 常常 给 哥哥 和 妹妹 打 电话。zhōumò wǒ chángcháng gěi gēge hé mèimei dǎ diànhuà.
On weekends I often call my older brother and younger sister.
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We have an entire course teaching Chinese grammar and vocabulary.