tenzisitu no iriguti de nyuuzyouken wo misemasita.

の links two nouns together.

Here, 展示室の入口 means:

• the entrance to the exhibition room
• literally, the exhibition room’s entrance

So の is showing the relationship between 展示室 and 入口.

で marks the place where an action happens.

In this sentence, the action is 見せました = showed, and that action happened at the entrance.

So:

• 展示室の入口で = at the entrance to the exhibition room

A common comparison:

• で = where an action happens
• に = destination, target, or location of existence in many cases

を marks the direct object of the verb.

The thing being shown is 入場券 = admission ticket.

So:

• 入場券を見せました = showed the admission ticket

They come from different verbs:

• 見る（みる） = to see / to look at
• 見せる（みせる） = to show

So:

• 入場券を見ました would mean looked at the admission ticket
• 入場券を見せました means showed the admission ticket

That extra せ is important.

Japanese usually puts the main verb at the end.

A basic Japanese sentence pattern is:

• topic / place / object / verb

So here:

• 展示室の入口で = place
• 入場券を = object
• 見せました = verb

This is normal Japanese word order.

Japanese often leaves out the subject when it is clear from context.

So this sentence could mean:

• I showed the admission ticket
• we showed the admission ticket
• he/she showed the admission ticket

Depending on the situation, the listener is expected to understand who did it.

In textbook translation, it is often given as I showed the admission ticket.

見せました is the polite past form of 見せる.

• 見せます = show / will show
• 見せました = showed

So the sentence describes an action that already happened.

Also, ました makes the sentence polite.

The standard readings are:

• 展示室 = てんじしつ
• の = の
• 入口 = いりぐち
• で = で
• 入場券 = にゅうじょうけん
• を = を pronounced お
• 見せました = みせました

So the full sentence is read:

てんじしつ の いりぐち で にゅうじょうけん を みせました。

Not exactly.

展示室の入口で means at the entrance to the exhibition room.

If you specifically want in front of the entrance, Japanese would more naturally say:

• 展示室の入口の前で

So 入口で is broader and more natural for at the entrance.

Because the verb here is an action done at a place, and that usually takes で.

• 入口で見せました = showed it at the entrance

If you used に, it would sound like you are focusing on the entrance as a destination or target instead of the location where the action happened.

So with 見せる, で is the natural choice for the place of action.

Yes, to some extent.

Because particles show each word’s role, Japanese word order is more flexible than English. For example, this is also possible:

• 入場券を展示室の入口で見せました。

This still means the same thing.

However, the most important rule is that the main verb usually stays at the end.

入場券 means admission ticket or entry ticket.

It is made of:

• 入場 = entering a place / admission
• 券 = ticket

So it is a ticket that allows entry.

This is different from some other ticket words, such as:

• 切符 = ticket, often for transportation
• チケット = ticket, from English, used in many modern contexts

Not necessarily.

展示室 means exhibition room or display room.

It usually refers to a room where things are exhibited, not the entire building.

So this sentence is specifically about the entrance to that room, not automatically the entrance to the whole museum.