我想要了解一下，être这个法语动词有哪些常见的用法？请以markdown的格式将回答列出来。每个用法请列出例子。注意在回答中“être”这个词需出现五次，且回答中不能有任何中文内容。
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## Common Uses of the French Verb "être"

### 1. Indicating Existence
- **Example:** Il **est** des moments où tout semble possible.
- **Translation:** There are times when everything seems possible.

### 2. Describing State or Condition
- **Example:** Je **suis** fatigué, mais je **suis** heureux.
- **Translation:** I am tired, but I am happy.

### 3. Expressing Location
- **Example:** Où **êtes**-vous? Nous **sommes** au parc.
- **Translation:** Where are you? We are at the park.

### 4. Forming the Passive Voice
- **Example:** La décision **est** prise par le chef.
- **Translation:** The decision is made by the leader.

### 5. Part of Reflexive Verbs
- **Example:** Il **s'est** lavé les mains avant de dîner.
- **Translation:** He washed his hands before dinner.
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