Usages of khi
Mẹ tôi thích nghe âm nhạc khi nấu ăn.
My mother likes to listen to music while cooking.
Trong văn phòng, chúng tôi thường nói chuyện bằng điện thoại khi đang họp.
In the office, we often talk on the phone while we are having a meeting.
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We have an entire course teaching Vietnamese grammar and vocabulary.