từ khi means "since" (preposition). since (from a particular time in the past until now).
How is từ khi pronounced?
You can listen to từ khi on this page in both Northern and Southern Vietnamese accents.
How is từ khi used in a sentence?
For example: Tôi học tiếng Trung từ khi còn nhỏ. (I've been learning Chinese since I was a child.); Từ khi chuyển nhà, tôi bận hơn. (I've been busier since moving.).
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