剧本是电影、电视剧、话剧等影视作品的基础，它是一种文学形式，具有特定的格式和规范。剧本的格式和范本对于创作者来说非常重要，因为它可以帮助他们更好地组织故事结构和编写对话。

剧本的格式要求一般包括以下几个方面：

1. 页面设置。剧本通常采用标准的页面设置，一般设置为8.5 x 11英寸纸张大小，左右边距为1英寸，上下边距为1.5英寸。

2. 标题页。剧本的标题页应包含剧本的名称、作者的姓名、联系方式和创作日期等信息。

3. 镜头描述。镜头描述是指对场景、物品、人物等的描写，它应该简洁明了，不要过于冗长，以便于导演和演员理解。

4. 角色和对白。剧本中的每个角色都应该有明确的身份和性格特点，并且对白应该符合角色的个性和背景。对白应该紧凑、生动，不能过于啰嗦。

5. 时间和地点。剧本中应该明确时间和地点，以便于观众理解故事情节。

范本是指已经完成的、符合规范的剧本样本。它可以作为创作者的参考，帮助他们更好地了解剧本的格式和规范。下面是一个电影剧本的范本：

INT. HOTEL ROOM - DAY

JACK, 30s, sits at a desk typing on a laptop. He’s disheveled and has dark circles under his eyes.

JACK

(to himself)

Come on, come on.

The phone RINGS, interrupting his work. Jack answers.

JACK (CONT'D)

Hello?

CUT TO:

EXT. STREET - DAY

SARAH, 20s, paces back and forth on the sidewalk. She’s talking on her phone.

SARAH

(into phone)

I’m telling you, he’s up to something.

CUT BACK TO:

INT. HOTEL ROOM - DAY

JACK

(into phone)

I’m sorry, Sarah. I’ve been busy.

CUT TO:

EXT. STREET - DAY

SARAH

(into phone)

Busy doing what, Jack?

CUT BACK TO:

INT. HOTEL ROOM - DAY

JACK

(into phone)

Just some work stuff. It’s nothing.

CUT TO:

EXT. STREET - DAY

SARAH

(into phone)

I don’t believe you.

CUT BACK TO:

INT. HOTEL ROOM - DAY

JACK

(into phone)

Sarah, please. I’ll explain everything when I get back.

CUT TO:

EXT. STREET - DAY

SARAH hangs up the phone and looks around nervously.

CUT BACK TO:

INT. HOTEL ROOM - DAY

Jack sighs and goes back to work. The camera pans down to show a gun on the desk next to his laptop.

END OF SCENE

以上是一个简单的剧本范本，它包含了场景描述、角色对话和时间地点等要素，符合剧本的格式和规范。