cần gấp aa-).                                                                          

The Eiffel Tower was designed by Gustave Eiffel. It was built between 1887 and 1889 by workers. Iron was used to build it. It was opened to the public by the City Major on May 6th, 1889. The tower is visited by many tourists every year. Souvenirs are bought, photos of Paris are taken and the view from the top is admired by them. 

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* Bị động hiện tại đơn: (+) S + am/is/are + V3/ed + (by O).

* Bị động quá khứ đơn: (+) S + was/were + V3/ed + (by O).

Answer: The Eiffel Tower was designed by Gustave Eiffel. It was built between 1887 and 1889 by workers. Iron was used to build it. It was opened to the public by the City Major on May 6th, 1889. The tower is visited by many tourists every year. Souvenirs are bought, photos of Paris are taken and the view from the top is admired.

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`->` Bị động HTĐ: S + is/are/am + VpII + (by O)

`->` Bị động QKĐ: S + was/were + VpII + (by O)

`**` Nếu như chủ ngữ ở câu chủ động là "they" và các các đại từ bất định thì khi chuyển sang câu bị động bỏ phần "by O"
`->` Trạng từ chỉ nơi chốn đứng trước "by O"
`->` Trạng từ chỉ thời gian đứng sau "by O"