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b, 1 – 2 + 3 – 4 + . . . + 99 – 100 c, 2 – 4 + 6 – 8 + . . . + 48 – 50 d, – 1 + 3 – 5 + 7 - . . . . + 97 – 99 e, 1 + 2 - 3 - 4 + .. . + 97 + 98 - 99 - 100 B
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Exercise 4: Convert the following passive sentences into positive (+), negative (-) and questionable (?) In the present simple tense and past simple tense. (Chuyển những câu bị động dưới đây về thể khẳng định (+), phủ định (-) và nghi vấn (?) ở thì hiện tại đơn và quá khứ đơn.) 1. (+) This table is made of wood. (-)__________________________________________. (?)__________________________________________? 2. (+)__________________________________________. (-) This book isn’t sold in many bookstores. (?)__________________________________________? 3. (+)This gift is wrapped in colorful paper. (-)__________________________________________. (?)__________________________________________? 4. (+)_________________________________________________________ (-)_________________________________________________________ (?) Was this piece of music composed y Mozart? 5. (+)_________________________________________________________ (-) The keys weren’t found in her bedroom (? ) ________________________________________________________ 6. (+) the statue was destroyed years ago. (-)_________________________________________________________ (? ) ________________________________________________________

Exercise 3: Underline the mistake and correct it 1. My keys were find in the living room. ________________________________________________________________ 2. Household rubbish is took to a large dump. ________________________________________________________________ 3. The local library located near the local school. ________________________________________________________________ 4. The chair was fixed with Jim. ________________________________________________________________ 5. This fridge was bought in 2000 by my brothers. ________________________________________________________________ 6. The birthday cake was cutted into 8 pieces. ________________________________________________________________ 7. The organization were founded in 1970. ________________________________________________________________ 8. The streets are litter with rubbish. ________________________________________________________________ 9. The old man helped by his grand children. ________________________________________________________________ 10. Many houses were destroy in the flood. ________________________________________________________________

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