Bài 1: 1, 6, 7, 9 laf cần thiết (còn lại là không)
Tips cho cậu nè: nếu object ở đằng sau là chung chung như people, someone hay him her... thì nó không cần đâu nhe.
1. This table isn't made of wood.
Is this table made of wood?
2. This book is sold in many bookstores.
Is this book sold in many bookstores?
3. This gift isn't wrapped in colourful paper.
Is this gift wrapped in colourful paper?
4. Tickets are sold at the entrance.
Tickets aren't sold at the entrance.
5. The car is polished regularly.
Is the car polished regularly?
6. The grass isn't cut every week.
Is the grass cut every week?
7. These tomatoes aren't grown at...
Are these tomatoes grown at...
8. The bank is always closed at 4:30.
The bank isn't...