1. The water is contaminated, so people get serious diseases.

→If water weren't contaminated, people wouldn't get serious diseases.

2. Put trash into the garbage bins or the street will become a garbage dump.

→If we don't put trash into the garbage bins, the street will become a garbage dump.

3. They have invented new devices to help people live a longer life

→New devices have been invented to help people live a longer life.

4. "I'm going to read a book about Thomas Edison tomorrow"

→ Nick said that he was going to read a book about Thomas Edison the next day.

5. Today isn't a holiday, so we cannot go to the beach.

→ If today were a holiday, we could go to the beach.

~ Gửi bạn ~

1. If the water were not contaminated,  people wouldn't get serious diseases.

2. If we put the trash into the garbage bins, the street won't become a garbage dump.

3. New devices have been invented to help people live a longer life ( câu bị động ở thì hiện tại hoàn thành: S+ have/ has+ been+ V3 )

4. Nick said that he was going to read a book about Thomas Edison

5. If today was a holiday, we could go to the beach

Giải thích

a. Conditional sentence type 1 ( Điều kiện có thể xảy ra ở hiện tại hoặc tương lai)

If clause: Present simple

Main clause: S+ will/may/can + V+ O

b. Conditional sentence type 2 ( Điều kiện không có thực hoặc không thể xảy ra ở hiện tại )

If clause: Past simple

Main clause: S+ would/might/could + V+ O