Usages of dìdi
我 弟弟 明年 要 上 大学， 他 很 兴奋。wǒ dìdi míngnián yào shàng dàxué, tā hěn xīngfèn.
My younger brother will go to university next year, and he is very excited.
周末 我 和 弟弟 在 公园 踢 足球。zhōumò wǒ hé dìdi zài gōngyuán tī zúqiú.
On weekends my younger brother and I play soccer in the park.
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We have an entire course teaching Chinese grammar and vocabulary.