ryokou no mae ni, juudenkeeburu o kaban ni ireta ka douka kakuninshimasu.

Before a trip, I check whether I put the charging cable in my bag.

Breakdown of ryokou no mae ni, juudenkeeburu o kaban ni ireta ka douka kakuninshimasu.

• を: direct object particle
• の: possessive case particle
• に: time particle
• 旅りょ行こう: trip

Questions & Answers about ryokou no mae ni, juudenkeeburu o kaban ni ireta ka douka kakuninshimasu.

Why is の used in 旅行の前に?

の links 旅行 and 前 so that 前 is specifically the time before the trip.

• 旅行 = trip, travel
• 前 = before, front
• 旅行の前 = before the trip

A good way to think of it is that の turns 旅行 into something like a modifier for 前.

Compare:

• 旅行の前に = before the trip
• 食事の前に = before the meal
• 授業の前に = before class

Without の, 旅行前 can exist in some contexts, but 旅行の前に is the more standard and beginner-friendly structure.

What does 前に mean here, and why is there a に after 前?

In this sentence, 前に means before in a time sense.

The に marks the time point relative to which the main action happens:

• 旅行の前に = before the trip
• then the main action: 確認します = check

So the structure is:

• [time expression] に + action

Examples:

• 寝る前に、歯を磨きます。 = Before sleeping, I brush my teeth.
• 出かける前に、鍵を確認します。 = Before going out, I check the keys.

Here, 前に is functioning as a set phrase meaning before doing / before something.

Why is 入れた in the past tense if the sentence ends with 確認します in the present/future?