zhège nǚrén zài mǎi shícái.

In this sentence, 在 + verb shows that an action is in progress, similar to English is buying.

So:

• 买 = buy
• 在买 = is buying / is in the middle of buying

That is why 这个女人在买食材 means This woman is buying ingredients, not just This woman buys ingredients.

A few comparisons:

• 这个女人买食材。 = This woman buys ingredients / This woman buys ingredients in general
• 这个女人在买食材。 = This woman is buying ingredients right now

Because 是 is not used like English to be before most verbs.

In English, we say:

• She is buying

But in Mandarin, you usually do not say 她是买...

Instead, you use:

• the verb directly: 她买食材
• or 在 + verb for an ongoing action: 她在买食材

So 是 is mainly used to link nouns or noun phrases, as in:

• 她是老师。 = She is a teacher.

But with action verbs like 买, 吃, 看, 写, you usually do not put 是 before them.

这个 means this.

It is made of:

• 这 = this
• 个 = a very common measure word / classifier

In Mandarin, when a demonstrative like 这 or 那 comes before a noun, you usually need a measure word:

• 这个女人 = this woman
• 那个男人 = that man

So the pattern is:

• 这 / 那 + measure word + noun

Here, 个 is the measure word being used with 女人.

Yes. 个 is the most common and general measure word, and it is completely natural here.

So:

• 一个女人 = a woman
• 这个女人 = this woman
• 那个女人 = that woman

There are sometimes more specific measure words in Chinese for certain nouns, but 个 is very common, useful, and correct here.

Usually, learners should use 这个女人.

这女人 can appear in speech or certain styles, but it is less neutral and can sound more colloquial, emotional, or context-dependent. For standard everyday Mandarin, 这个女人 is the safer choice.

So if you are learning, use:

• 这个女人在买食材。

The word order is very similar to English:

• 这个女人 = this woman
• 在 = indicates ongoing action
• 买 = buy
• 食材 = ingredients

So the structure is:

• Subject + 在 + Verb + Object

In full:

• 这个女人 / 在 / 买 / 食材。

This makes it fairly straightforward for English speakers.

Not exactly.

食材 usually means ingredients, especially ingredients used for cooking.

Examples:

• vegetables, meat, tofu, mushrooms, spices, and other things you cook with

食物 means food in a broader sense.

So:

• 食材 = ingredients / cooking ingredients
• 食物 = food in general

If someone is shopping for things to cook with, 食材 is a very good word.

Sometimes, but the meaning changes.

• 食材 = ingredients
• 菜 can mean vegetable, dish, or cuisine, depending on context

If you say:

• 这个女人在买菜。

that often means This woman is buying groceries/vegetables or buying food ingredients for cooking, and it is a very common everyday expression.

If you say:

• 这个女人在买食材。

that sounds a bit more specific and focused on ingredients.

So both can work in some situations, but 买菜 is more colloquial and common in daily speech.

Because 在 + verb already strongly suggests an ongoing action, so now/right now is often understood from context.

You could add a time word if you want:

• 这个女人现在在买食材。 = This woman is buying ingredients now.

But it is not required. Mandarin often leaves out information that is clear from context.

Both spellings are related to the same word, but learners usually see it written as zhège in pinyin.

A few useful points:

• 这 is fourth tone: zhè
• 个 by itself is usually fourth tone: gè
• but in natural speech inside 这个, the 个 is often lighter and less stressed

So you may hear something like:

• zhège
• or a lighter zhège

For learning purposes, zhège is perfectly fine.

Because the vowel sound in 女 is the ü sound, not a regular u sound.

So:

• 女 = nǚ
• 女人 = nǚrén

This is an important pronunciation point. The ü sound is made with the tongue position of ee but with rounded lips.

English speakers often accidentally say nu, but that is not correct here.

Usually both syllables are pronounced, but the first syllable nǚ is often a bit more prominent.

• 女 = third tone
• 人 = second tone

So:

• nǚrén

Make sure not to reduce 人 too much. It should still be clearly pronounced.

Also remember that 女人 simply means woman, but depending on context it can sometimes sound more like female/woman in a general sense. In everyday conversation, people might also use:

• 女士 = lady, Ms. (more polite/formal)

That would not be the natural choice here.

To express an action in progress, the standard and common pattern is:

• 在 + verb
• so: 这个女人在买食材。

The 着 particle is used differently. It often describes a continuing state rather than the ongoing process of an action.

So for is buying, use:

• 在买

not usually:

• 买着

Yes, if the subject is clear from context.

Mandarin often omits subjects when they are already known. For example, if you are looking at a picture and it is obvious who you mean, you could simply say:

• 在买食材。 = (She is) buying ingredients.

But if you are introducing the person or describing the picture clearly, 这个女人在买食材 is better.

Yes, it is grammatically correct and natural.

That said, in everyday conversation, a native speaker might also say:

• 这个女人在买菜。

because 买菜 is a very common everyday way to say someone is buying groceries or vegetables for cooking.

Still, 这个女人在买食材。 is perfectly understandable and natural, especially if you want to emphasize ingredients rather than groceries in general.