ichinichi nihongo o benkyoushimasu.

direct object particle

Breakdown of ichinichi nihongo o benkyoushimasu.

• 日に本ほん語ご: Japanese (language)
• 勉べん強きょうする: to study

Questions & Answers about ichinichi nihongo o benkyoushimasu.

Why is there no word for “I” in this sentence?

Japanese often leaves out the subject when it’s obvious from context.

• In English we must say “I study Japanese …”
• In Japanese, if it’s clear we’re talking about ourselves, just 日本語を勉強します is fine.

If you really want to include it, you can say:

• 私は一日日本語を勉強します。 – As for me, I will study Japanese for one day / all day.

But in normal conversation, 私は is usually omitted unless you need to contrast or emphasize “I” specifically.

What exactly does 一日 mean here?

一日 can mean two different things, with different readings:

1. いちにち – “one day / all day / for a day” (duration)
2. ついたち – “the first (day) of the month” (a calendar date)

In your sentence, there is no に particle after 一日, so it’s most naturally read:

• いちにち – “for one day” or “(for) the whole day”

So the sentence means something like:

• “(I) study Japanese for one whole day / all day.”

Why is there no particle after 一日? Shouldn’t it be 一日で or 一日間 or 一日に?