kouzyou wo kengakusita ato, kaigisitu de situmon wo simasu.

Because in this sentence 工場 is the object of 見学する.

• 見学する means to inspect / to observe / to tour
• What is being toured or observed? The factory
• So Japanese marks it with を

Compare:

• 工場を見学する = tour/inspect the factory
• 工場で働く = work at the factory

So even though 工場 is a place, here it is treated grammatically as the thing being looked at or toured, not the place where another action happens.

Because あと in this pattern usually follows the past short form of a verb when it means after doing X.

So:

• 見学したあと = after touring/inspecting
• literally: after (someone) toured/inspected

This is a very common grammar pattern:

• 食べたあと = after eating
• 帰ったあと = after going home
• 勉強したあと = after studying

So V-た + あと is the key pattern here.

Here あと means after.

The structure is:

• [verb in past short form] + あと = after doing ...

So:

• 工場を見学したあと = after touring the factory

It connects the first action to the next one:

1. tour the factory
2. then ask questions in the meeting room

It does not necessarily mean immediately after, unless the context suggests that.

Because で marks the location where an action takes place.

• 会議室で質問をします = ask questions in the meeting room

Here, 質問をする is an action, and で tells you where that action happens.

By contrast, に is often used for:

• destination: 会議室に行く = go to the meeting room
• existence: 会議室に人がいる = there is a person in the meeting room

So:

• で = where the action happens
• に = destination/existence/point in time, etc.

Both are possible.

• 質問をします
• 質問します

The version with を makes it clearer that 質問 is the noun question(s) and する is the verb do.

This is a very common pattern with nouns that can combine with する:

• 勉強をする / 勉強する
• 練習をする / 練習する
• 質問をする / 質問する

In careful or textbook-style Japanese, 質問をします is very normal. In everyday speech, 質問します is also very common.

Because Japanese uses the non-past form for both:

• present/habitual actions
• future actions

So 質問をします can mean:

• ask questions
• will ask questions
• are going to ask questions

The exact time comes from the context. In this sentence, the sequence with あと makes it clear that this is a future or planned action:

• after touring the factory, we will ask questions in the meeting room

This is completely normal in Japanese.

Yes, the subject is omitted.

Japanese often leaves out subjects when they are obvious from context. So this sentence could mean:

• we will tour the factory and then ask questions
• you will tour the factory and then ask questions
• the group will do these things

Without context, Japanese does not force the speaker to state the subject.

That is very natural. In English, you usually need a subject, but in Japanese it is often unnecessary.

The sentence is:

• 工場を見学したあと、会議室で質問をします。

A helpful breakdown is:

1. 工場を見学した
   = toured the factory

2. あと
   = after

3. 会議室で質問をします
   = ask questions in the meeting room

So the full structure is:

• [First action] + あと, [second action]

This is a very common way to show sequence in Japanese.

It can mean either, depending on context.

Japanese nouns usually do not change form for singular vs. plural. So:

• 質問をします can mean ask a question
• or ask questions

The surrounding situation tells you which is more natural. In a factory visit context, ask questions is probably the most natural interpretation.

Here are the readings:

• 工場 = こうじょう
• 見学した = けんがくした
• あと = あと
• 会議室 = かいぎしつ
• で = で
• 質問 = しつもん
• を = pronounced お
• します = します

So the whole sentence is read:

こうじょう を けんがくした あと、かいぎしつ で しつもん を します。

Yes. Both are natural.

• 見学したあと
• 見学したあとで

Both mean after touring/inspecting. The で after あと is often optional in this kind of sentence.

So these are both fine:

• 工場を見学したあと、会議室で質問をします。
• 工場を見学したあとで、会議室で質問をします。

The version without で is slightly simpler, but both are common.

Not exactly.

• 見る = to see / to look / to watch
• 見学する = to inspect / to observe / to tour for learning purposes

見学する is used when you visit a place or watch something in an organized or educational way, such as:

• a factory tour
• observing a class
• touring a facility

So in this sentence, 見学する is much more natural than 見る, because it suggests a proper visit or tour of the factory.