Here are the correct forms for the sentences provided, with explanations for the grammar used in each case. 1. The Factory Sentence: It's a big factory. Five hundred people are employed there.
- Explanation: This is the Present Simple Passive. We use the passive voice because the people receive the action of being employed by the company.
2. Water Surface (Active) Sentence: Water covers most of the Earth's surface.
- Explanation: This is the Present Simple Active. This is a general fact or a permanent state where the subject ("water") is performing the action.
3. Water Surface (Passive) Sentence: Most of the Earth's surface is covered by water.
- Explanation: This is the Present Simple Passive. Here, the focus shifts to the surface being acted upon by the water.
4. The Park Gates Sentence: The park gates are locked at 6.30 p.m.
- Explanation: This is the Present Simple Passive. It describes a regular routine or a rule. Since the gates do not lock themselves, the passive voice is required.
5. The Letter Sentence: The letter was posted a week ago and it arrived yesterday.
- Explanation:
- was posted: This is the Past Simple Passive. The action happened at a specific time in the past ("a week ago") and the letter received the action.
- arrived: This is the Past Simple Active. "Arrive" is an intransitive verb (it doesn't take an object), so it is used in the active voice to describe the completion of the movement.
Summary Table
| Sentence | Correct Form | Tense | Voice |
|---|---|---|---|
| 1 | are employed | Present Simple | Passive |
| 2 | covers | Present Simple | Active |
| 3 | is covered | Present Simple | Passive |
| 4 | are locked | Present Simple | Passive |
| 5 | was posted / arrived | Past Simple | Passive / Active |
Would you like me to provide more practice sentences focusing on the difference between active and passive voice?
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