tuōpán lǐ yǒu jīshuǐ.

It uses the very common Mandarin pattern:

Location + 有 + thing

So here:

• 托盘里 = in the tray
• 有 = there is / there are
• 积水 = standing water / pooled water

A very literal English gloss would be:

In the tray, there is standing water.

This pattern is one of the main ways Mandarin expresses there is / there are.

Yes, 有 can mean to have, but it also has an existential use, meaning there is / there are.

In this sentence, it does not mean that the tray possesses something in an owner-like sense. It means that something exists in that location.

Compare:

• 我有一本书。 = I have a book.
• 桌子上有一本书。 = There is a book on the table.

So in 托盘里有积水, 有 means there is.

Because 是 is used to link one thing to another, like A is B.

But this sentence is not identifying the tray as standing water. It is saying that standing water exists in the tray.

So:

• 托盘里有积水。 = There is standing water in the tray. ✔
• 托盘里是积水。 = unnatural in normal usage ✘

If you use 是, it sounds like you are saying what is in the tray is standing water, which is not the normal way to express this idea.

里 means inside or in.

In Mandarin, location words like 里, 上, 下, 外, 前, 后 usually come after the noun they relate to.

So:

• 托盘里 = inside the tray
• literally: tray + inside

This is different from English, which usually puts the preposition first: in the tray.

You can think of 里 as a localizer or postposition.

Because in the pattern Location + 有 + thing, Mandarin usually does not need 在.

So the natural form is:

• 托盘里有积水。

Not usually:

• 在托盘里有积水。

The version with 在 is not the normal neutral way to say it. In simple existential sentences, Mandarin normally just puts the location directly before 有.

A useful rule of thumb is:

• Location + 有 + noun = there is something somewhere

Examples:

• 桌子上有一本书。
• 房间里有人。
• 托盘里有积水。

Not exactly.

积水 means water that has collected, pooled, or remained somewhere. It often suggests unwanted standing water.

So it is more specific than just 水.

• 水 = water
• 积水 = standing water / pooled water / accumulated water

For example, after rain, water that stays on the ground can be called 积水.

So this sentence is not just saying there is water in the tray. It suggests water has built up or is sitting there.

Good question. Both 里 and 上 relate to location, but they describe different kinds of space.

• 里 = inside
• 上 = on top of / on the surface of

A tray usually has edges, so water is understood as being contained within it, which makes 托盘里 very natural.

If you said 托盘上, that would focus more on the tray’s surface. That can work in some contexts, but for liquid sitting in a tray, 里 is usually better.

So:

• 托盘里有积水。 = the water is in the tray / collected inside it
• 托盘上有水。 = there is water on the tray’s surface

Because 积水 is being treated as a mass noun, like water in English.

Mass nouns often appear without a classifier when you are speaking generally about the substance.

So:

• 有积水 = there is standing water

If you wanted to count a particular puddle or amount, you would need a measure word, for example:

• 有一滩积水 = there is a puddle of standing water

But in the original sentence, the speaker is just stating that standing water is present, so no classifier is needed.

The pinyin is:

tuōpán lǐ yǒu jīshuǐ

Tones:

• 托 tuō — 1st tone
• 盘 pán — 2nd tone
• 里 lǐ — 3rd tone
• 有 yǒu — 3rd tone
• 积 jī — 1st tone
• 水 shuǐ — 3rd tone

One important point: 里有 is a 3rd tone + 3rd tone combination. In natural speech, the first 3rd tone usually changes to a rising tone, so lǐ yǒu is pronounced more like:

lí yǒu

This is standard third-tone sandhi.

You use 没有, not 不有.

So:

• 托盘里没有积水。 = There is no standing water in the tray.

That is the normal negative form for existential 有 sentences.

Compare:

• 有 = there is / there are
• 没有 = there is not / there are not

Two common ways:

1. Add 吗

   • 托盘里有积水吗？
   • Is there standing water in the tray?

2. Use the A-not-A form

   • 托盘里有没有积水？
   • Is there standing water in the tray or not?

Both are natural. The second one often sounds a little more conversational.

Yes.

• 托盘里有积水
• 托盘里面有积水

Both are natural and mean the same thing.

里面 is just a slightly fuller form of 里. In many everyday sentences, they are interchangeable.

Very roughly:

• 里 = shorter, very common
• 里面 = slightly more explicit, also very common

Mandarin does not use articles like a and the the way English does.

So 托盘 by itself does not explicitly mark:

• a tray
• the tray

The exact meaning comes from context.

In this sentence, English will often translate it as the tray if a specific tray is already known. But depending on context, it could also be understood more generally.

Also, Mandarin nouns do not automatically show plural. So unless something else marks number, 托盘 is just tray / trays in a neutral sense, with context deciding the best English translation.