How do you form the passive voice?

Hello there! As a language expert with a keen interest in English grammar, I'm excited to share with you an in-depth explanation of how to form the passive voice in English. The passive voice is a versatile tool that can be used to shift the focus of a sentence from the subject to the object, or to omit the subject entirely when it's not important or unknown.

### Understanding the Passive Voice

In an active voice sentence, the subject performs the action of the verb. For example, "The cat chased the mouse." Here, "the cat" is the subject and "chased" is the verb showing the action performed by the subject.

In contrast, the passive voice places the focus on the action itself and what is affected by the action, rather than who or what is performing the action. The object of the active sentence becomes the subject of the passive sentence.

### Steps to Form the Passive Voice

#### Step 1: Identify the Object in the Active Sentence

The first step in forming the passive voice is to identify the object of the active sentence. This will become the subject of the passive sentence. For instance, in the sentence "The chef cooked the meal," the object is "the meal."

#### Step 2: Change the Verb to the Past Participle Form

The verb in the passive voice must be in the past participle form. This form is often the same as the past tense for regular verbs but can be different for irregular verbs. For the verb "to cook," the past participle is "cooked."

#### Step 3: Use the Appropriate Form of the Verb "to Be"

The passive voice requires the use of a form of the verb "to be" followed by the past participle of the main verb. The form of "to be" you use depends on the tense you want to convey. For the present tense, you would use "is" or "are." For the past tense, you might use "was" or "were." For future tense, "will be" is used.

#### Step 4: Make the Object of the Active Sentence the Subject of the Passive Sentence

Now, take the object from the active sentence and make it the subject of the new passive sentence. In our example, "the meal" becomes the subject.

#### Step 5: Add the Subject of the Active Sentence as the Agent (Optional)

If you want to include the original subject of the active sentence (the doer of the action), you can add it as the agent with the preposition "by." However, it's not always necessary, especially if the doer is unknown or unimportant.

#### Example Transformation

Active Voice: The chef cooked the meal.
Passive Voice: The meal was cooked (by the chef).

### Variations and Additional Considerations

- Present and Past Tenses: The passive voice can be formed in both the present and past tenses, using the appropriate form of "to be."
- Modal Verbs: When using modal verbs, they are followed by the base form of the main verb and then the past participle.
- Get as an Alternative to Be: In some informal contexts, "get" can be used instead of "to be" to form the passive voice, especially in American English.

### Common Uses of the Passive Voice

- Emphasizing the Action or the Receiver: When the action or the receiver of the action is more important than the doer.
- Unknown or Unimportant Actor: When the doer of the action is unknown or not important to the context.
- Scientific and Formal Writing: The passive voice is often used in scientific and formal writing to maintain an objective tone.

### Conclusion

The passive voice is a valuable grammatical structure that can help you emphasize different parts of a sentence and adapt your writing to different contexts. By following the steps outlined above, you can effectively use the passive voice to enhance your English communication skills.

Now, let's move on to the translation of the explanation into Chinese.

Form of Passivethe object of the active sentence becomes the subject of the passive sentence.the finite form of the verb is changed (to be + past participle)the subject of the active sentence becomes the object of the passive sentence (or is dropped)