6. Although Bob was ill, nobody took him to the hospital
=>In spite of Bob's illness , nobody took him to the hospital
7. What's the weight of your suitcase?
=>How heavy is your suitcase
8. There was never any answer when he rang.
=> Every time he rang , There was never any answer
9. My grandfather wrote the letter in 3 hours
=>It took My grandfather  3 hours writing  the letter