1. Between 2000 and 2012,  $1,7 trillionin was caused by natural disaters in damage.

2. If our seas weren't polluted, fish and other marine would not die everyday.

3. Mary said her brother wanted to become an astronaut in the future.

4. It was a pity that he refused to come to the party yesterday.

`1.` Between 2000 and 2012, $1.7 trillion in damage was caused by natural disasters.

Giải thích: Câu bị động quá khứ đơn: was/were Vpp

`2.` If our seas weren't seriously polluted, fish and other marine creatures wouldn't die every day.

Giải thích: Câu điều kiện loại 2 diễn tả giả thiết không có thật ở hiện tại: If S V-ed, S would/could/might V.

`3.` Mary said her brother wanted to become an astronaut in the future.

Giải thích: Câu tường thuật phải lùi thì.

`4.` It was a pity that he refused to come to the party yesterday.

Giải thích: It is/was a pity that + mệnh đề: thật đáng tiếc khi...

@ `Ly`