Humans need a constancy supply of water to live.

• Sửa: "constancy" -> "constant"
• Câu đúng: Humans need a constant supply of water to live.

The storm sudden it and destroyed the whole village.

• Sửa: "sudden" -> "suddenly"
• Câu đúng: The storm suddenly hit and destroyed the whole village.

Were the children studying at school in this time yesterday?

• Sửa: "in this time" -> "at this time"
• Câu đúng: Were the children studying at school at this time yesterday?

You can save energy by turning off lights and use public transport.

• Sửa: "use" -> "using"
• Câu đúng: You can save energy by turning off lights and using public transport.