1.The library lends books to both students and teachers.
=>Both students and teachers can borrow books from the library.
2. My mother is always busy from morning till night.
=>My mother is never free from morning till night.
3. Our sources of energy will soon end if we don't try save them.
=> Unless we try to save them, our sources of energy will soon end.
Hok Tốt
@Bắp