kaigi de mondai ga kaiketusimasita.

It is read:

かいぎ で もんだい が かいけつしました。

Word by word:

• 会議 → かいぎ = meeting
• で = at / in / during
• 問題 → もんだい = problem
• が = subject marker
• 解決しました → かいけつしました = was resolved / got resolved / solved

Here, で marks the place, setting, or occasion where something happens.

So 会議で means:

• at the meeting
• in the meeting
• during the meeting

In this sentence, it tells you the context in which the problem was resolved.

A useful way to think about it:

• 会議で = at the meeting
• 学校で = at school
• 日本で = in Japan

So で is not marking the subject or object here; it is marking the setting of the action/event.

This is a very common question.

With 問題が解決しました, the sentence focuses on the problem being resolved.

• が marks 問題 as the thing that underwent the change
• the nuance is close to the problem got resolved or the problem was resolved

If you say 問題を解決しました, that sounds more like:

• (someone) solved the problem

That version focuses more on the person or agent doing the solving, even if that person is omitted.

So the difference is roughly:

• 問題が解決しました = The problem was resolved / got resolved
• 問題を解決しました = (Someone) solved the problem

In real Japanese, 問題が解決しました is very natural when the important point is the result, not who did it.

Because Japanese often leaves out information that is understood from context or not important.

In this sentence, the speaker cares most about the fact that:

• the problem is now resolved

The identity of the solver may be:

• obvious from context
• unknown
• unimportant
• intentionally not mentioned

English often prefers to say:

• We solved the problem at the meeting
• The problem was solved at the meeting

Japanese is often comfortable just saying:

• 問題が解決しました

without naming the person or group.

解決しました is the polite past form.

Breakdown:

• 解決する = to be resolved / to solve, depending on usage
• 解決します = polite non-past
• 解決しました = polite past

In this sentence, it means something like:

• was resolved
• got resolved
• resolved

The ました ending makes it polite, so this is the kind of form you would use in normal conversation, business situations, reports, and so on.

For an English speaker, it can feel a little unusual.

In English, we often say:

• The problem was solved

That is passive.

In Japanese, 問題が解決しました is a very natural way to express a similar idea without using the regular passive form. It presents the problem as reaching a resolved state.

So it is often best to understand it as:

• The problem was resolved
• The problem got resolved

rather than trying to force a one-to-one match with English grammar labels.

No, that would not be natural here.

Use で because the meeting is the setting/event where the resolution happened.

• 会議で問題が解決しました。 = correct

に is used for things like:

• destination: 学校に行きます = go to school
• specific time: 3時に行きます = go at 3
• target/recipient: 先生に聞きます = ask the teacher

A meeting here is not a destination or recipient; it is the occasion where something happened, so で is the right particle.

The basic order is:

[setting] + [subject] + [verb]

So:

• 会議で = at the meeting
• 問題が = the problem
• 解決しました = was resolved

Japanese verbs normally come at the end.

A very literal gloss would be:

• At the meeting, the problem resolved.

That sounds strange in English, but it shows the Japanese structure.

Natural English would be:

• The problem was resolved at the meeting.
• The problem got resolved during the meeting.

Yes, Japanese word order is more flexible than English, as long as the particles stay attached to the right words.

For example, these are both possible:

• 会議で問題が解決しました。
• 問題が会議で解決しました。

Both mean roughly the same thing, but the emphasis may shift slightly.

• 会議で… first: starts by setting the scene
• 問題が… first: starts by highlighting the problem

The particles で and が are what tell you how the words relate, so they are very important.

No. で does not mean the meeting is the doer.

It only tells you the place, situation, or occasion where the event happened.

So 会議で問題が解決しました means:

• the resolution happened at/during the meeting

It does not mean:

• the meeting itself acted like a person and solved it

If you wanted to say who solved it, you would need different wording, such as mentioning a person or group.

Yes, it sounds neutral to polite.

Reasons:

• 解決しました uses the polite -ました form
• 会議 and 解決 are somewhat formal/business-like words

So this sentence sounds very natural in contexts like:

• office conversation
• meetings
• reports
• status updates
• presentations

A more casual style would be:

• 会議で問題が解決した。

That is the plain form instead of the polite form.