sensei ni mou ichido setsumei o onegaishimashita.

direct object particle

Breakdown of sensei ni mou ichido setsumei o onegaishimashita.

• 先せん生せい: teacher
• に: indirect object particle
• 説明せつめい: explanation

Questions & Answers about sensei ni mou ichido setsumei o onegaishimashita.

Why is に used after 先生?

に marks the person the request is directed to.

So in this sentence:

• 先生に = to the teacher
• 説明をお願いしました = made a request for an explanation

A natural way to think about it is:

• X に お願いする = to ask/request X
• Y を お願いする = to request Y

So here:

• 先生に = the person being asked
• 説明を = the thing being asked for

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Why is を used after 説明?

Because 説明 is the thing being requested.

In 説明をお願いしました, the を marks the content/object of the request: an explanation.

So the structure is:

• 先生に = from/to the teacher
• 説明を = an explanation
• お願いしました = requested

This is a very common pattern:

• 先生に質問をお願いしました
• 友だちに手伝いをお願いしました

In each case, を marks what was requested.

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What does もう一度 mean exactly?