Present & past simple passiveunit 6

Present & Past simple passiveUnit 6

Present simple passive

We often use the passive when we talk or write about science, technology and processes.

• The electricity is conducted through your body.
• Water is cooled to below 8ºC and then carbon dioxide is forced into the bottle under pressure.

Present simple passive

In a passive sentence, the subject is not the agent. The object of an active sentece becomes the subject of a passive sentence. If we want to mention de agent, we use by.

• ACTIVE --> A machine forces carbon dioxide into the bottle.
• PASSIVE --> Carbon dioxide is forced into the bottle by a machine

Past simple passive

We often use the past simple when we talk or write about science, technology and processes.

• His machine was built for the Science Museum in London.
• The Analytical Engine was design by the English inventor Charles Babbage.

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