niúròu, yángròu, dòufu hé mógu dōu mǎiqí le.

In Chinese, when listing several nouns, it is very common to separate most items with 、 and then optionally use 和 before the last item, much like A, B, C, and D in English.

So:

• 牛肉、羊肉、豆腐和蘑菇
• = beef, lamb, tofu, and mushrooms

You do not normally put 和 between every item.

Natural patterns include:

• A、B、C和D
• sometimes just A、B、C、D without 和

They do different jobs:

• 、 is a punctuation mark used for listing items.
• 和 is a word meaning and.

So in this sentence:

• 牛肉、羊肉、豆腐和蘑菇

the 、 separates items in a list, and 和 links the final item to the rest of the list.

A rough English equivalent would be:

• beef, lamb, tofu, and mushrooms

都 means all.

It shows that the statement applies to all of the listed things, not just one of them. So the sentence is saying that all of those items have been bought completely.

Compare:

• 牛肉买齐了。 = The beef has all been bought / the beef is fully taken care of.
• 牛肉、羊肉、豆腐和蘑菇都买齐了。 = Beef, lamb, tofu, and mushrooms have all been bought.

In Chinese, when you mention several things and want to say something is true for every one of them, 都 is very common.

买 simply means to buy.

买齐 means something more specific: to buy everything needed so that the set is complete.

Here, 齐 adds the idea of complete / all present / all there.

So:

• 买了 = bought
• 买齐了 = bought them all / finished buying everything needed

This is often used when someone has a shopping list or a set of required items.

For example:

• 东西买齐了吗？ = Have you bought everything?
• 菜都买齐了。 = All the groceries have been bought.

This is a very common question.

• 买完 focuses on finishing the action of buying
• 买齐 focuses on having a complete set of needed items

So the difference is:

• 买完了 = finished buying
• 买齐了 = bought everything necessary; nothing is missing

Sometimes they overlap, but not always.

For example:

• If you finished shopping but forgot one ingredient, you could say you 买完了 the things you bought, but not necessarily 买齐了 everything you needed.
• 买齐了 strongly suggests the shopping list is now complete.

The final 了 shows a new situation or change of state.

Here, it means that the situation has changed from:

• the items were not all bought yet

to:

• the items are now all bought

So 买齐了 here means not just a past action, but also the result: now everything has been bought.

In many cases, sentence-final 了 is very natural when reporting that something has now been completed.

Because the sentence is naming the items in a general category sense, not counting units of them.

Here, the nouns are treated like items on a shopping list:

• 牛肉 = beef
• 羊肉 = lamb/mutton
• 豆腐 = tofu
• 蘑菇 = mushrooms

Chinese classifiers are usually needed when you specify a number or demonstrative, for example:

• 一块豆腐 = a piece of tofu
• 两斤牛肉 = two jin of beef
• 这些蘑菇 = these mushrooms

But when you simply list what kinds of things were bought, no classifier is needed.

Many Chinese nouns are compounds.

For example:

• 牛 = cow/cattle
• 肉 = meat

• 牛肉 = beef

• 羊 = sheep/goat
• 肉 = meat
• 羊肉 = lamb/mutton

This is very common in Chinese: one part gives the category, and another part gives the type.

Similarly:

• 蘑菇 = mushroom
• 豆腐 = tofu

Even though these are two-character words, they function as single vocabulary items.

In everyday Chinese, 羊肉 can refer broadly to meat from a sheep, and in English it may be translated as lamb or mutton depending on context.

Chinese usually does not always make the same age-based distinction that English does between lamb and mutton. So if you see 羊肉 on its own, a general translation like lamb or mutton may both be acceptable depending on the situation.

Because the second syllable fu in 豆腐 is usually pronounced in the neutral tone.

So it is:

• dòufu

not:

• dòufǔ

This is very common in everyday words in Mandarin: the second syllable may become light and unstressed.

Another familiar example is:

• 东西 = dōngxi

not dōngxī

Usually 都 comes after the whole subject/list and before the verb phrase it applies to.

So this sentence is natural:

• 牛肉、羊肉、豆腐和蘑菇都买齐了。

This structure is very common:

• A、B、C都...

You generally would not put 都 before the list.

For learners, a good rule is:

• mention the group first
• then use 都
• then say what is true about all of them

It is mainly about the result.

The key idea is not just someone bought these things, but that all the needed items are now in place. That result meaning comes from:

• 买齐 = buy until complete
• 了 = the situation has now changed

So the sentence feels like a status update:

• Everything on this part of the shopping list is now taken care of.

You could, but the meaning or naturalness would change.

• 牛肉、羊肉、豆腐和蘑菇买齐了。

  • understandable, but 都 makes it clearer that the statement applies to all listed items

• 牛肉、羊肉、豆腐和蘑菇都买齐。

  • this sounds incomplete in normal speech; without 了, it lacks the natural sense of completed change of state

So in this sentence, 都 and 了 both help make it sound natural and complete.