Usages of khi
Tôi có thể giúp bạn bán phở ở cửa hàng khi bạn bận.
I can help you sell phở at the store when you are busy.
Chúng tôi rất vui khi bán cà phê ở cửa hàng.
We are very happy when selling coffee at the store.
An rất bận khi làm việc ở cửa hàng.
An is very busy when working at the store.
Gia đình tôi đã rất vui khi gặp bạn.
My family was very happy to meet you.
Tôi đã rất vui khi gặp lại bạn bè cũ ở trường.
I was very happy to meet old friends again at school.
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