neboushitan desu. sorede, machiawase ni okuresou desu.

I overslept. So I might be late for our meeting.

Breakdown of neboushitan desu. sorede, machiawase ni okuresou desu.

• です: to be
• に: destination particle
• 〜た: past tense
• 遅おくれる: to be late

Questions & Answers about neboushitan desu. sorede, machiawase ni okuresou desu.

Why is there no subject like I in this sentence?

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

In 寝坊したんです。それで、待ち合わせに遅れそうです。, the speaker is almost certainly talking about themselves, so English would naturally supply I:

• I overslept.
• So, I’m likely to be late for our meetup.

This kind of omission is extremely common in Japanese.

What does んです mean in 寝坊したんです?

んです adds an explanatory or background-giving tone.

So 寝坊したんです is not just a bare statement of fact. It sounds more like:

• I overslept, you see.
• The thing is, I overslept.
• I overslept — that’s why.

It is often used when giving a reason, explanation, or justification.

Why is it 寝坊したんです and not 寝坊しましたんです?

Because んです attaches to the plain form of the verb, not the polite ます form.

So the pattern is:

• plain past verb: 寝坊した
• • のです / んです
• = 寝坊したんです

is not correct Japanese.