It can mean one volunteer or volunteers. Chinese nouns often do not change form for singular vs. plural.
You figure it out from context.
So 志愿者正在发放生活用品 could mean:
If you really want to stress plural, you can say 志愿者们, but that is often unnecessary.
Because 们 is optional in many cases, and Chinese often leaves plural unmarked when the meaning is already clear.
Using 志愿者们 can sound more specific or more like the volunteers as a known group. Without 们, the sentence sounds more neutral and natural in many contexts, especially captions, news writing, or general descriptions.
So:
Because this is an action sentence, not an A is B sentence.
是 is used when you identify or equate things:
But when the subject is doing something, Chinese usually just uses the verb directly:
So English often needs is/are, but Chinese does not put 是 before a normal action verb.
发放 means to distribute, to hand out, or to issue something, usually in an organized way.
It is more formal and specific than just 发, which can simply mean to send out, to hand out, or to give out.
发放 is often used for things like:
So in this sentence, 发放 fits well because volunteers are distributing items systematically, not just casually handing over one thing.
生活用品 means daily necessities, everyday supplies, or items for daily life.
It is made up of:
Depending on context, it can include things like:
In disaster relief or charity contexts, it often means basic living supplies.
A related word is 日用品, which also means daily-use items. The two can overlap a lot.
Because Chinese usually follows this basic order:
Subject + adverb/aspect marker + verb + object
So here:
This is very normal Chinese word order.
English says:
Chinese says, more literally:
The grammar works differently, but the order is standard.
Because Chinese does not have articles like English.
So Chinese usually does not directly mark:
Whether something is definite or indefinite usually comes from context.
That is why:
If Chinese wants to be more specific, it uses other tools, such as:
For example:
Because classifiers are usually needed when there is a number or a demonstrative.
For example:
But in the original sentence, 生活用品 is just a general object, so no classifier is required.
That is very normal.
Usually, not in the same way.
正在 shows an action is ongoing, while 了 often marks completion or a new situation. Because of that, beginners should normally keep them separate here:
If you want to sound more natural while emphasizing that the action is happening right now, 呢 is often possible:
So as a beginner, it is safest to think:
It is natural, but it has a slightly formal / report-like tone.
That comes mainly from:
This kind of wording is very common in:
In everyday conversation, people might say something a bit simpler, such as:
So the original sentence is correct and natural, but it sounds a little more official or written.
者 is a suffix meaning person, especially a person connected with an action, role, or identity.
So:
You can see the same 者 in other words:
It is a very useful suffix to recognize because it often tells you that the whole word refers to a person.