eki de kippu o otoshimashita.

Here, で marks the place where the action happens.

So 駅で means at the station or in the station, in the sense that the dropping happened there.

• 駅で切符を落としました。 = I dropped my ticket at the station.

This is different from に, which often marks a destination, a point in time, or a location of existence.

Because this sentence is about where an action took place.

• で = where someone does something
• に = where something exists, where someone/something goes, or a specific target point

In this sentence, the action is dropping the ticket, so で is the natural particle:

• 駅で切符を落としました。 = I dropped my ticket at the station.

If you used に here, it would sound unnatural for this meaning.

を marks the direct object of the verb.

The direct object is the thing affected by the action. Here, the thing being dropped is 切符.

• 切符を落としました。 = dropped the ticket

So:

• 切符 = ticket
• を = marks ticket as the object
• 落としました = dropped

This is a very common question because Japanese often distinguishes between:

• transitive verbs: someone does something to an object
• intransitive verbs: something happens on its own

Here:

• 落とす = to drop something
• 落ちる = to fall

So:

• 切符を落としました。 = I dropped the ticket.
• 切符が落ちました。 = The ticket fell.

Since the sentence includes 切符を, it needs the transitive verb 落とす.

The dictionary form is 落とす.

落としました is the polite past form.

Breakdown:

• 落とす = to drop
• 落としました = dropped / have dropped

The ました ending shows:

• politeness
• past tense

So the sentence sounds polite and natural in everyday conversation.

Because Japanese often omits the subject when it is clear from context.

In English, you usually need to say I dropped the ticket. In Japanese, if it is obvious who did it, you can simply say:

• 駅で切符を落としました。

The listener will usually understand it as:

• I dropped my ticket at the station or
• Someone dropped a ticket at the station
  depending on context.

If you wanted to make I explicit, you could say:

• 私は駅で切符を落としました。

But very often, 私は is left out.

切符 means ticket, especially a physical ticket, such as:

• a train ticket
• a bus ticket
• an admission ticket

In this sentence, because of 駅 (station), most learners will naturally understand 切符 as something like a train ticket.

It is read きっぷ.

A useful pronunciation note:

• the small っ makes the following consonant stronger or doubled
• so きっぷ sounds roughly like kip-pu, not ki-pu

The sentence is read:

• えき で きっぷ を おとしました。

Word by word:

• 駅 → えき
• で → で
• 切符 → きっぷ
• を → usually pronounced お
• 落としました → おとしました

A useful note: the particle を is written with the character を, but in modern Japanese it is usually pronounced お.

Not completely, but the basic order here is very natural.

Japanese usually puts the verb at the end, and particles show each word’s role, so the order is more flexible than in English.

This sentence follows a common pattern:

• place + object + verb

So:

• 駅で切符を落としました。

You may also hear variations like:

• 切符を駅で落としました。

That is still understandable because:

• で still marks the place
• を still marks the object

But the original order is straightforward and natural for learners.

Literally, 落としました means dropped.

However, in real life, saying you dropped something can strongly imply that you lost it, especially if you do not have it anymore.

So depending on context, this sentence can feel like:

• I dropped my ticket at the station.
• or more loosely, I lost my ticket at the station.

But grammatically, the verb itself is specifically to drop.

Yes. You could add は if you want to mark the topic.

For example:

• 私は駅で切符を落としました。 = As for me, I dropped my ticket at the station.

This can be helpful if:

• you want to clarify who did it
• you are contrasting yourself with someone else
• you want to set I as the topic

But if the subject is already obvious, leaving it out is more natural and common.