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`1`. You should travel by public transport.

`-` S + should + V-inf: nên làm gì

`2`. Electric buses are eco `-` friendly so they will become popular in big cities soon.

`-` S + V + so + S + V: … vậy nên …

`3`. If resorts by the sea are still expensive, many people won’t go there for their holidays next year.

`-` Câu điều kiện loại `1`: If + S + V(-s/es), S + will + V-inf

`4`. Our city might have a skyTran system in the near future.

`-` S + might + V-inf: có thể sẽ (chỉ một dự đoán không chắc chắn)

`5`. In a decade, people will have new green modes of travel and they will spend their holidays in new places.

`-` S + V + and + S + V: … và …