qǐng quèdìng gōuhuǒ yǐjīng xīmiè.

请 makes the sentence polite. It is often translated as please.

So 请确定... means please make sure... or please confirm....

In instructions, warnings, and signs, 请 is very common:

• 请坐。 = Please sit.
• 请注意安全。 = Please pay attention to safety.

Here, it softens the command, but the sentence is still clearly an instruction.

In this sentence, 确定 means make sure, confirm, or ascertain.

So 请确定篝火已经熄灭 means something like:

• Please make sure the campfire is out.
• Please confirm that the campfire has already been extinguished.

A useful point: 确定 can have different uses:

• as a verb: to confirm / determine / make sure
• as an adjective: certain / definite

Examples:

• 我不确定。 = I’m not sure.
• 请确定时间。 = Please confirm the time.

In your sentence, it is a verb.

Mandarin often does not need an explicit word for that when one clause follows another.

Here, 确定 is followed directly by the thing being confirmed:

• 篝火已经熄灭

So the structure is basically:

请 + 确定 + [篝火已经熄灭]

That whole clause functions like the object of 确定.

This is very normal in Chinese. English often requires that, but Chinese usually just puts the clause after the verb.

已经 means already. Here it shows that the speaker wants you to verify a completed state: the campfire should already be out by the time you check it.

So the logic is:

• first, the campfire gets extinguished
• then, you make sure that this is true

That is why 已经 works well here.

In natural English, you might not always translate it literally as already. A smoother translation is often:

• Please make sure the campfire is fully out.

So 已经 is there because the sentence is about confirming a result, not just giving the action extinguish the campfire.

Good question. 已经 often appears with 了, but 了 is not always required.

You can say:

• 篝火已经熄灭。
• 篝火已经熄灭了。

Both are possible.

The version without 了 can sound a bit more formal, concise, or written, which fits a safety instruction well. The version with 了 may sound a bit more like everyday spoken Chinese.

So here:

• 已经 is enough to show completion
• 了 is optional, not mandatory

熄灭 means to go out, to be extinguished, or to extinguish something like a fire, flame, or light.

It is very commonly used for things such as:

• fires
• candles
• lamps
• cigarettes

Examples:

• 蜡烛熄灭了。 = The candle went out.
• 请把火熄灭。 = Please put out the fire.

Compared with 灭, 熄灭 often sounds a bit more specific and natural for flames or lights going out. In your sentence, 熄灭 is a very appropriate choice because 篝火 is a fire.

Here it is functioning intransitively.

That means the sentence is describing the campfire’s state:

• 篝火已经熄灭 = The campfire has already gone out / has been extinguished

There is no explicit person doing the extinguishing.

But 熄灭 can also be used transitively in other sentences:

• 他们熄灭了篝火。 = They extinguished the campfire.

So 熄灭 can work both ways depending on the sentence.

Mandarin often leaves out subjects when they are obvious from context.

In an instruction like this, the understood subject is you:

• 请确定... = Please make sure...

Chinese does this very often on signs, notices, and directions. It sounds natural and efficient.

If you added 你, it would usually sound unnecessary here:

• 请你确定篝火已经熄灭。

That is grammatically possible, but the original version is more natural for a general instruction.

Yes, it is natural, especially in a formal or instructional context.

It sounds like something you might see in:

• a park notice
• a camping safety guide
• a rule sheet
• an official reminder

A very natural English translation would be:

• Please make sure the campfire is completely out.

Native speakers might also use similar verbs such as:

• 请确认篝火已经熄灭。 = Please confirm the campfire is out.
• 请确保篝火已经熄灭。 = Please ensure the campfire is out.

So your sentence is good Chinese, with a slightly formal, safety-instruction tone.

Here are the words with tones:

• 请 qǐng — 3rd tone
• 确定 quèdìng — 4th tone + 4th tone
• 篝火 gōuhuǒ — 1st tone + 3rd tone
• 已经 yǐjīng — 3rd tone + 1st tone
• 熄灭 xīmiè — 1st tone + 4th tone

A rough rhythm for the whole sentence is:

qǐng | quèdìng | gōuhuǒ | yǐjīng | xīmiè

Try not to pronounce each syllable too separately. Say it smoothly as one instruction: Qǐng quèdìng gōuhuǒ yǐjīng xīmiè.

Yes. A very literal translation is something like:

Please make sure the campfire has already been extinguished.

But more natural English would often be:

• Please make sure the campfire is out.
• Please make sure the campfire has been fully extinguished.
• Please ensure the campfire is completely out.

This is a good reminder that Chinese and English do not always sound most natural when translated word-for-word.