watashi wa ukkari ie ni shiryou o wasurete shimaimashita.

I carelessly left the documents at home.

Breakdown of watashi wa ukkari ie ni shiryou o wasurete shimaimashita.

• は: topic particle
• 私わたし: I
• を: direct object particle
• 家いえ: home

Questions & Answers about watashi wa ukkari ie ni shiryou o wasurete shimaimashita.

Why is うっかり in the sentence, and what nuance does it add?

うっかり is an adverb that means something like carelessly, accidentally, or without thinking.

In this sentence, it shows that the speaker did not intentionally leave the materials at home. It adds the feeling of:

• Oops, I wasn’t paying attention
• I did it by mistake
• It happened unintentionally

So it makes the sentence sound more like I accidentally left the documents at home rather than a plain factual statement.

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Why is は used after 私?

は marks 私 as the topic of the sentence.

So 私は means something like:

• As for me,
• Speaking of me,
• I

In natural English, we often just translate it as I, but grammatically は is not exactly the same as an English subject marker. It introduces what the sentence is about.

In Japanese, 私は is often omitted when it is already obvious who is speaking. So in many real-life situations, the sentence could simply be:

うっかり家に資料を忘れてしまいました。

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Why is 家 marked with に?