5. English is(the language used in aviation It is spoken around the world..(relative clause) ⇒ English, which is spoken around the world, is the language used in aviation. 6. He worked very hard, but he didn't feel tired. (Although) ⇒ Although he works very hard, he didn't feel tired. 7. Sword Lake is in Ha Noi. The water of it is always blue. (relative clause) ⇒ The Sword Lake, which water is always blue, is in Ha Noi. 8. Do you know the woman? They are talking about that woman. (relative clause) ⇒ Do you know the woman whose they are talking?
