HSK 2
啊
a助
sentence-final particle expressing affirmation, approval or consent
好啊，我们一起去看电影。
Hǎo a, wǒmen yìqǐ qù kàn diànyǐng.
Sure, let's go see a movie together.
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Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 2.