Usages of hễ ... là ...
Hễ tìm tài liệu là tôi dùng từ khóa.
Whenever I search for material, I use a keyword.
Hễ tôi hoàn trả bản in là thủ thư kiểm tra.
Whenever I return a printed copy, the librarian checks it.
Hễ sách sắp quá hạn là tôi gia hạn.
Whenever a book is nearly overdue, I renew it.
Hễ vào phòng đọc là tôi xuất trình thẻ.
Whenever I enter the reading room, I present my card.
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