watasi ha apuri de kaigi no zikan wo kaeraremasu.

は marks the topic of the sentence.
So 私は means something like as for me or speaking of me.

In this sentence, 私は sets up who the sentence is about:

• 私は = as for me / I
• アプリで会議の時間を変えられます = can change the meeting time using the app

In natural Japanese, 私 is often omitted if it is already clear from context. So a native speaker might simply say:

• アプリで会議の時間を変えられます。

That can still mean I can change the meeting time in the app, depending on the situation.

Here, で marks the means or tool used to do something.

So:

• アプリ = app
• アプリで = with the app, using the app, or in the app

In this sentence, it means the app is the method/tool used to change the time.

This is the same で you see in sentences like:

• ペンで書きます。 = I write with a pen.
• 日本語で話します。 = I speak in Japanese.

So アプリで does not mean at the app. It means by using the app.

Literally, 会議の時間 means the meeting’s time.

Breaking it down:

• 会議 = meeting
• の = links one noun to another
• 時間 = time

So 会議の時間 means:

• the time of the meeting
• more naturally in English: the meeting time

This is a very common use of の in Japanese: noun + の + noun.

Examples:

• 学校の先生 = the school’s teacher / a teacher at the school
• 日本の映画 = a Japanese movie / a movie from Japan

Because 会議 is modifying 時間 as a noun, not acting as the subject or object of the verb.

In other words:

• 会議の時間 is one noun phrase: the meeting time

Here, 会議 is not doing the action, and it is not directly receiving the action. It is just specifying what kind of time we mean.

So:

• 会議の時間 = meeting time
• not the meeting changes time
• not change the meeting

That is why の is used.

を marks the direct object of the verb.

The verb here is 変えられます = can change.

So the thing being changed is:

• 会議の時間を = the meeting time

That is why 時間 takes を.

So the structure is:

• 私は = as for me
• アプリで = using the app
• 会議の時間を = the meeting time
• 変えられます = can change

変えられます is the polite form of the potential form of 変える.

Breakdown:

• 変える = to change something
• 変えられる = can change
• 変えられます = can change (polite)

So in this sentence, it means am able to change or can change.

Here it is potential, meaning can change.

That is a very common question, because -られる can mark either:

• potential: can do
• passive: be done

But in this sentence, the meaning is clearly potential:

• 私は ... 変えられます = I can change ...

If it were passive, the meaning would be strange here.

So:

• 変えられます here = can change
• not is changed

Context tells you which meaning is intended.

Because 変えます means change, while 変えられます means can change.

Compare:

• 会議の時間を変えます。 = I change / will change the meeting time.
• 会議の時間を変えられます。 = I can change the meeting time.

So the sentence is talking about ability or possibility, not just the action itself.

That is a great question.

With potential expressions, Japanese often uses が for the thing that can be done:

• 会議の時間が変えられます。

But in modern Japanese, を is also commonly used with many potential verbs, especially in everyday speech:

• 会議の時間を変えられます。

Both can be heard, though the nuance may vary a little depending on the verb and style.

A simple way to think about it:

• が can sound a bit more like the thing is possible to change
• を can sound a bit more like I can change the thing

In this sentence, を is perfectly understandable and common.

It can feel like either in English, depending on the situation.

Japanese で here marks the method/tool, so literally it is closer to:

• using the app
• with the app

But in natural English, you might translate it as:

• in the app
• on the app
• using the app

For example, if this is a scheduling app, English speakers might naturally say:

• I can change the meeting time in the app.

So the Japanese is about the means or platform used, and English may phrase that in different ways.

Not always.

Japanese often leaves out the subject when it is obvious from context. So if everyone already knows you are talking about yourself, you could simply say:

• アプリで会議の時間を変えられます。

That would still naturally mean:

• I can change the meeting time using the app or possibly
• You can change the meeting time using the app or
• We can change the meeting time using the app

depending on context.

So 私 is not wrong, but it can sound a little more explicit or textbook-like if the subject is already clear.

It is polite because it uses ます form:

• 変えられます

That makes it suitable for normal polite conversation, customer service, workplace situations, and so on.

Less polite / plain form:

• アプリで会議の時間を変えられる。

More formal wording might use a different verb, such as:

• アプリで会議の時間を変更できます。

That sounds a bit more formal or administrative.

Both can work, but they have slightly different feels.

• 変える = everyday, common, straightforward change
• 変更する = more formal, more technical, more written/business-like make a change / modify

So:

• 会議の時間を変えられます。 = natural and conversational
• 会議の時間を変更できます。 = more formal, often seen in notices, apps, office language, instructions

If this sentence appears in a textbook, either could appear depending on the style they want.

The basic structure is:

私は / アプリで / 会議の時間を / 変えられます。

You can think of it like this:

• 私は = topic: as for me
• アプリで = means/tool: using the app
• 会議の時間を = object: the meeting time
• 変えられます = verb: can change

So the sentence follows a very common Japanese pattern:

Topic + method + object + verb

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

For example, these are all possible:

• 私はアプリで会議の時間を変えられます。
• 私は会議の時間をアプリで変えられます。
• アプリで私は会議の時間を変えられます。

They do not all sound equally natural in every context, but they are understandable because the particles show the roles:

• は = topic
• で = means
• を = object

The most neutral version is the original one.

Usually, 変えられます most naturally means can change in the sense of ability or possibility.

Depending on context, English can may imply:

• ability
• permission
• system capability

For example, in an app guide, アプリで会議の時間を変えられます could mean:

• You can change the meeting time in the app
• meaning the app allows it

So the Japanese does not always sharply separate ability and permission/system possibility. Context helps decide the best English wording.

A more natural everyday version might omit 私:

• アプリで会議の時間を変えられます。

Or in plain casual style:

• アプリで会議の時間を変えられる。

If the speaker wants to sound even more conversational, they might choose a slightly different phrasing depending on the context, such as:

• アプリで会議の時間、変えられるよ。

But the original sentence is completely fine as a clear polite example sentence.