HSK 1
在
zài动介副
to exist; to be alive; (of sb or sth) to be (located) at; (used before a verb to indicate an action in progress)
妈妈现在在家做饭。
Māma xiànzài zài jiā zuò fàn.
Mom is cooking at home now.
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New in the HSK 3.0 word list at level 1.