Usages of trước khi
Tôi sẽ sửa cửa sổ trước khi trời mưa.
I will fix the window before it rains.
Tôi sửa máy tính cũ trước khi gửi email.
I fix the old computer before sending an email.
Chị phải gọi điện thoại cho khách trước khi khách đến khách sạn.
I (older sister) have to call the guests before they arrive at the hotel.
Tối nay tôi phải tắm và dọn bếp trước khi xem phim.
Tonight I have to shower and clean the kitchen before watching a movie.
Test yourself: What does trước khi mean?
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