Oxit lưỡng tính là: Những oxit chỉ tác dụng được với muối. Những oxit tác dụng với dung dịch bazơ tạo thành muối và nước. Những oxit tác dụng với dung dịch bazơ và tác dụng với dung dịch axit tạo thành muối và nước. Những oxit tác dụng với dung dịch axit tạo thành muối và nước.

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Bài 1: Viết lại các câu sau sử dụng cách nói gián tiếp. Yêu cầu bài làm : gạch chân từ cần đổi hoặc cần bỏ, viết công thức dạng câu loại nào. 1.“Open the door.” he said to them. - He told them......................................................................................... 2. “Where are you going?” he asked her. - He asked her where.......................................................................... 3. “Which way did they go?” he asked. - He asked... .................................................................................... 4. “Bring it back if it doesn’t fit.”, I said to her. - I told... ...................................................................................... 5. “Don’t try to open it now.” she said to us. - She told... ........................................................................................ 6. “Is it going to be a fine day today?” I asked her. - I asked her... .......................................................................................... 7. “He’s not at home.”, she said. - She said that... ...................................................................................... 8. “Is the bus station far away?” the girl asked. - The girl wanted to know... ................................................................... 9. “Don’t stay out late, Ann.” Tom said. - Tom told Ann... ................................................................................. 10. “Please let me borrow your car.” he said to her. - He asked... ........................................................................................... 11. “Jean, have you seen my gloves?” Thomas asked. - Thomas asked Jean................................................................................ 12. Don’t leave the window open, Mary.”, I said. - I told Mary.... .................................................................................... 13. “I’ll have a cup of tea with you.” she said. - She said that................................................................................. 14. “I’ll pay him if I can.” she said. - She said that... ............................................................................... 15. “What are you going to do next summer?” she asked. - She asked us.... .............................................................................. 16. “I’ll phone you tomorrow.” he told Jack. - He told Jack that.... ........................................................................... 17. “Can I sit beside you, Jean?” Tom asked. - Tom asked Jean.... ........................................................................ 18. “I want a camera for my birthday.” he said. - He said that.... ............................................................................. 19. “Don’t keep the door locked.” he said to us. - He told us.... ................................................................................. 20. “How long are you going to stay?” I asked him. - I asked him how long…………………………………………………………………