Xiǎoyí gěi wǒ mǎi le yí jiàn xīn yīfu dàng shēngrì lǐwù.
My aunt bought me some new clothes as a birthday present.
Tips
mistakes
姨 is always your mother's side and 姑 your father's: 小姨 is your mother's youngest sister, 小姑 your father's youngest. A man talking about his wife's younger sister usually says 小姨子.
