wasuremono wo sinai you ni, dekakeru mae ni kaban no naka wo kakuninsimasu.

忘れ物 means a forgotten item or something left behind.

Japanese often makes verbs by combining a noun with する. So:

• 忘れ物 = forgotten thing
• 忘れ物をする = to have a forgotten item, meaning to leave something behind / forget something when going out

This is a natural Japanese expression. In English we usually say forget something or leave something behind, but Japanese commonly uses 忘れ物をする for that situation.

Here, ～ように means so that... or in order to...

So:

• 忘れ物をしないように = so that I won’t forget anything
• more naturally: to avoid forgetting something

This pattern is very common:

• verb dictionary form + ように = so that ...
• verb nai-form + ように = so that ... not / in order not to ...

Examples:

• 忘れないようにメモします。 = I make a note so that I won’t forget.
• 遅れないように早く出ます。 = I leave early so that I won’t be late.

Because Japanese uses the plain form before grammar patterns like ように.

So even in a polite sentence, the verb inside the clause stays plain:

• 忘れ物をしないように
• 出かける前に

Then the final verb shows the politeness of the whole sentence:

• 確認します

This is very normal in Japanese. The sentence can be polite overall even if earlier verbs are plain.

They are doing different jobs.

1. 忘れ物をしないように

   • ように is a fixed grammar pattern meaning so that / in order to

2. 出かける前に

   • this に marks the time point: before going out

So even though both are に, they do not mean the same thing here.

With 前, Japanese normally uses the dictionary form of the verb:

• 出かける前に = before going out

This is the standard pattern:

• V dictionary form + 前に = before doing V

Examples:

• 寝る前に歯を磨きます。 = I brush my teeth before sleeping.
• 食べる前に手を洗います。 = I wash my hands before eating.

So 出かける前に is the correct form.

かばんの中 means the inside of the bag or what’s in the bag.

The particle の connects nouns. It often works like of in English.

• かばん = bag
• 中 = inside
• かばんの中 = inside of the bag

This same pattern appears everywhere in Japanese:

• 学校の先生 = the school’s teacher / teacher at the school
• 日本の文化 = Japanese culture
• 箱の中 = inside the box

Because かばんの中 is the thing being checked, so it is the direct object of 確認します.

• かばんの中を確認します = check the inside of the bag

Here, を marks what is checked.

This may feel a little odd in English, because English often says check inside the bag, where inside looks more like a place. But in Japanese, かばんの中 can be treated as the object of checking.

Because they belong to different parts of the sentence.

1. 忘れ物をしないように

   • 忘れ物をする is one expression
   • here を marks 忘れ物 as the object of する

2. かばんの中を確認します

   • here を marks かばんの中 as the object of 確認します

So there is no problem. Japanese can have the same particle more than once in a sentence if each one belongs to a different clause or phrase.

Yes, the subject is omitted.

Japanese often leaves out the subject when it is clear from context. In a sentence like this, the implied subject is usually I:

• (私は) 忘れ物をしないように、出かける前にかばんの中を確認します。

But Japanese usually does not need to say 私は unless there is a reason to emphasize it or contrast it with someone else.

確認します means confirm, check, or make sure. It sounds more deliberate than 見ます.

Compare:

• 見ます = look / see
• 確認します = check carefully, verify, make sure

So:

• かばんの中を見ます = I look inside my bag.
• かばんの中を確認します = I check inside my bag to make sure everything is there.

In this sentence, 確認します fits better because the purpose is to avoid forgetting something.

Yes, to some extent.

Japanese word order is more flexible than English, especially with time and purpose phrases. For example, you could also say:

• 出かける前に、忘れ物をしないように、かばんの中を確認します。

This still means basically the same thing.

However, the original order sounds natural because it presents:

1. the purpose: to avoid forgetting something
2. the time: before going out
3. the action: I check my bag

So the original sentence flows very well.

Here are the main readings:

• 忘れ物 = わすれもの
• 出かける = でかける
• 前 = まえ
• 中 = なか
• 確認します = かくにんします

So the whole sentence is read:

わすれもの を しない よう に、でかける まえ に かばん の なか を かくにんします。