haitatuinsan ha gogo ni kodutumi wo todokemasu.

は marks the topic of the sentence.

So 配達員さんは means something like:

• As for the delivery person, ...
• The delivery person ...

In this sentence, the speaker is talking about what the delivery person does.

A learner often expects が here, but は is very common when you are simply introducing the topic rather than emphasizing who specifically is doing the action.

さん is a polite suffix, similar to Mr./Ms. in some situations, but more flexible.

配達員さん means the delivery person in a polite, respectful, human way. It sounds more natural and friendly than just 配達員 by itself in many everyday contexts.

A few important points:

• 配達員 = delivery worker / delivery person
• 配達員さん = the delivery person, politely
• You usually do not use さん for yourself

So this sentence sounds like someone politely referring to the delivery person.

Here, に marks a time point.

So:

• 午後 = afternoon
• 午後に = in the afternoon

Japanese often uses に with specific times to show when something happens.

In this sentence, 午後に tells you the time of the delivery action.

Note: With some time expressions, に can be omitted depending on the word and context, but 午後に is perfectly natural.

を marks the direct object of the verb.

So:

• 小包を届けます = deliver a package

The direct object is the thing being acted on. Here, the thing being delivered is 小包.

Also, remember that を is written を but pronounced o.

Japanese sentences usually place the main verb at the end.

So the basic structure here is:

• 配達員さんは = topic
• 午後に = time
• 小包を = object
• 届けます = verb

This is very normal Japanese word order.

In English, you say:

• The delivery person delivers the package in the afternoon.

But in Japanese, it is more like:

• As for the delivery person, in the afternoon, the package, delivers.

That final verb position is one of the biggest differences from English.

届けます is the polite non-past form of the verb 届ける.

That means it can express:

• a future action: will deliver
• a habitual action: delivers

Japanese non-past often covers both present and future, depending on context.

So 届けます could mean:

• will deliver
• delivers

The exact English translation depends on the situation.

This is a very common question.

• 届ける = to deliver something
• 届く = to arrive / to be delivered

So:

• 配達員さんは小包を届けます = The delivery person delivers the package.

But:

• 小包が届きます = The package arrives / is delivered.

The key difference is:

• 届ける is transitive: someone delivers something
• 届く is intransitive: something arrives

No. When は is used as a particle, it is pronounced wa.

So:

• 配達員さんは is pronounced haitatsuin-san wa

This is one of the first pronunciation surprises learners run into.

Similarly:

• を as a particle is usually pronounced o

So the full sentence is pronounced roughly:

Haitatsuin-san wa gogo ni kozutsumi o todokemasu.

Japanese does not have articles like a, an, and the.

So 小包 can mean:

• a package
• the package
• sometimes just package(s) depending on context

The listener figures out which one is meant from the situation.

That is very normal in Japanese. Context does a lot of work that articles do in English.

Not exactly. In natural English, 午後に is usually best understood as:

• in the afternoon

Japanese time expressions do not always match English prepositions one-for-one.

Even though に often gets explained as at/on/in, it is better to think of it as a time marker here, not as a word that always directly equals one specific English preposition.

小包 usually means a parcel or package, especially a relatively small mailed or delivered package.

荷物 is broader and can mean:

• luggage
• baggage
• load
• belongings
• package/cargo

So:

• 小包 = a parcel/package
• 荷物 = a more general word for baggage or goods

In this sentence, 小包 is a nice specific choice because the thing being delivered is a package.

Yes, Japanese word order is somewhat flexible, as long as the particles make the roles clear.

For example, these can still be understood:

• 配達員さんは小包を午後に届けます。
• 午後に、配達員さんは小包を届けます。

The particles は, に, and を tell you what each part is doing.

However, not every order sounds equally natural in every context. The original sentence is very standard and easy to follow.

A casual version would usually change the verb from 届けます to 届ける:

• 配達員さんは午後に小包を届ける。

Depending on the situation, people might also drop さん or use a different noun if speaking casually.

For example:

• 配達員は午後に小包を届ける。

But this can sound less warm or less polite. The original sentence with 届けます is a polite, neutral sentence and is very safe for learners to use.