"You should avoid glass windows during an earthquake, Harry."

→ They advised Harry to avoid glass windows during an earthquake.

"She gave us practical tips about treating poisonous wastes."

→ We were given practical tips about treating poisonous wastes.

"The forest fire has raged for more than two days."

→ The forest fire began more than two days ago.

"Children should be accompanied by adults when going out."

→ It is a good idea for children to be accompanied by adults when going out.

"The teacher will arrive soon and then we will start the experiment."

→ As soon as the teacher arrives, we will start the experiment.

"If we make proper preparations, we can reduce damage."

→ Unless we make proper preparations, we cannot reduce damage.