ame de katudou wo tyuusisimasita.

It is read:

あめ で かつどう を ちゅうししました。

More naturally as a full sentence:

Ame de katsudō o chūshi shimashita.

Notes:

• 雨 = あめ = rain
• 活動 = かつどう = activity / activities
• 中止しました = ちゅうししました = canceled / called off

Here, で shows cause/reason.

So 雨で means because of the rain or due to rain.

This is a very common use of で with things like:

• weather
• accidents
• illness
• natural causes

Examples:

• 雪で電車が止まりました。 = The train stopped because of snow.
• 病気で休みました。 = I was absent because of illness.

So in your sentence, 雨で活動を中止しました means the activity was canceled because of rain.

No. Although で often marks the place where an action happens, that is not what it means here.

Compare:

• 公園で遊びます。
  Here で = in/at the park, showing location.

• 雨で活動を中止しました。
  Here で = because of, showing cause.

So the meaning of で depends on context.

Because 活動 is the direct object of 中止しました.

The verb phrase 中止する means to cancel / to discontinue / to call off.
So the thing being canceled is marked with を.

Pattern:

• X を 中止する = cancel X

Examples:

• 試合を中止しました。 = We canceled the game.
• イベントを中止しました。 = We canceled the event.
• 活動を中止しました。 = We canceled the activity.

It is built from a noun + する pattern.

• 中止 = cancellation / stoppage
• 中止する = to cancel / to call off
• 中止しました = canceled / called off / did cancel

This is very common in Japanese. Many Sino-Japanese nouns become verbs with する.

Examples:

• 勉強する = to study
• 電話する = to call
• 説明する = to explain
• 中止する = to cancel

So 中止しました is the polite past form of 中止する.

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

So 雨で活動を中止しました could mean:

• We canceled the activity because of rain.
• They canceled the activity because of rain.
• The school canceled the activity because of rain.

Japanese speakers often do not mention the subject unless it is necessary.

If you wanted to state it clearly, you could say:

• 学校は雨で活動を中止しました。 = The school canceled the activity because of rain.
• 私たちは雨で活動を中止しました。 = We canceled the activity because of rain.

Because しました is the past polite form of する.

So 中止しました means:

• canceled
• called off
• did cancel

The sentence describes something that already happened.

If you wanted present/future meaning, you would say:

• 雨で活動を中止します。 = We will cancel / cancel the activity because of rain.

In Japanese, the non-past form can refer to the present or future depending on context.

Yes. 雨のため(に) also means because of rain.

Compare:

• 雨で活動を中止しました。
• 雨のため、活動を中止しました。

Both are correct, but there is a nuance difference:

• 雨で sounds simple, direct, and very common in everyday speech.
• 雨のため(に) sounds a bit more formal or written.

You might see 雨のため in announcements, notices, or official explanations.

Both can sometimes be translated as stopped or canceled, but they are not the same.

• 中止する = to cancel / call off something planned, organized, or scheduled
• やめる = to stop doing something / quit / give up

In your sentence, 中止しました is better because an activity is something that can be officially called off.

Compare:

• 活動を中止しました。 = The activity was canceled.
• 活動をやめました。 = We stopped the activity / quit the activity.

So 中止しました sounds more like an organized cancellation, while やめました is broader and less formal.

Yes. In English, we often prefer a passive sentence:

• The activity was canceled because of rain.

But Japanese often uses an active form with the subject omitted:

• 雨で活動を中止しました。

Literally, it is closer to:

• (Someone) canceled the activity because of rain.

In natural translation, however, The activity was canceled because of rain is often the best English rendering.

It could be either, depending on context.

Japanese nouns usually do not show singular/plural clearly unless needed.

So 活動 could mean:

• the activity
• activities

In this sentence, English often uses the activity if one specific activity is being discussed. But if context involves multiple organized activities, it could be activities.

Yes, it is very similar.

• 雨で活動を中止しました。 = We canceled the activity because of rain.
• 雨が降ったので活動を中止しました。 = We canceled the activity because it rained.

The difference:

• 雨で focuses on rain as the cause
• 雨が降ったので focuses on the fact that it rained

Both are natural.
雨で is shorter and very common in announcements or brief explanations.