haha ha bentoubako ni tamagoyaki wo irete, watasi ni watasimasita.

母 is the plain word for my mother when talking about your own mother to someone else.

A very common pattern in Japanese is:

• 母 = my mother / one’s own mother, used humbly or neutrally when referring to her
• お母さん = mom / mother, often used when addressing her directly or when referring to someone else’s mother more politely

So in this sentence, 母は is the natural way to say as for my mother.

The は marks 母 as the topic of the sentence.

So 母は means something like:

• As for my mother, ...
• My mother ...

It does not directly mark the subject in the same way English does. Instead, it sets up what the sentence is about.

In this sentence, once 母 is introduced as the topic, the rest of the sentence tells us what she did:

• put tamagoyaki into the lunch box
• handed it to me

Here, に marks the destination/location something goes into.

So:

• 弁当箱に入れる = to put something into a lunch box

Compare:

• 箱に入れる = put it in the box
• かばんに入れる = put it in the bag

In this sentence, 弁当箱に tells us where the 卵焼き was placed.

The particle を marks the direct object of the verb.

Here, the thing being put into the lunch box is 卵焼き.

So:

• 卵焼きを入れる = put in the tamagoyaki

Even though English might say put tamagoyaki into the lunch box, Japanese marks:

• the thing moved with を
• the destination with に

So the structure is:

• 弁当箱に 卵焼きを 入れる
• put tamagoyaki into the lunch box

卵焼き is a Japanese-style rolled omelet, often slightly sweet or seasoned, and it is a very common item in a bento.

So even if the translation simply says omelet or fried egg, the Japanese word usually refers to this specific dish, not just any egg preparation.

The て-form here connects one action to the next.

• 入れて = put in, and then...
• 渡しました = handed/gave

So the sentence describes two actions in sequence:

1. Mother put the tamagoyaki into the lunch box
2. Mother handed it to me

This is a very common use of the て-form: linking actions done by the same person.

So the sentence feels like:

• She put the tamagoyaki into the lunch box and handed it to me.

This に marks the recipient of the action.

• 私に渡しました = handed it to me

With verbs like 渡す (to hand, to pass, to give), に often marks the person who receives the object.

Examples:

• 先生に渡す = hand it to the teacher
• 友だちに渡す = hand it to a friend

So in this sentence:

• the lunch box is handed to me

渡す focuses on the physical act of handing over or passing something.

• 渡す = hand/pass/give over

By contrast:

• あげる = give (from the giver’s perspective)
• くれる = give (to me/us, from the receiver’s perspective)

So 私に渡しました sounds like:

• she handed it to me
• she passed it to me

This fits the image of physically preparing the lunch box and then giving it directly to the speaker.

Most naturally, the object of 渡しました is something omitted, and it is understood from context as the lunch box / the bento.

The sentence literally says:

• Mother put tamagoyaki into the lunch box, and handed [it] to me.

The thing handed to the speaker is probably not just the tamagoyaki by itself, but the lunch box containing it.

Japanese often leaves out obvious words when the meaning can be understood from context. This is very normal.

Because 弁当箱 is not the thing being directly acted on by 入れる. It is the destination.

With 入れる:

• thing being put in = を
• place/container it goes into = に

So:

• 卵焼きを弁当箱に入れる = put the tamagoyaki into the lunch box

If you used 弁当箱を, it would suggest the lunch box itself is the direct object, which would not fit this verb in this meaning.

Yes. Japanese word order is flexible as long as the particles make the roles clear.

This sentence is:

• 母は 弁当箱に 卵焼きを 入れて、私に 渡しました。

You could also hear:

• 母は 卵焼きを 弁当箱に 入れて、私に 渡しました。

Both are natural. The particles tell you what each noun is doing:

• は = topic
• に = destination / recipient
• を = direct object

So Japanese does not rely on word order as heavily as English does.

Because the sentence is describing completed actions.

• 入れて links the first action
• 渡しました is the final verb, and its tense sets the tense for the whole sequence

So the whole sentence is understood as past:

• she put the tamagoyaki into the lunch box
• she handed it to me

If the final verb were non-past, the sentence would sound like a habitual or future action depending on context.

Not always. Japanese often omits 私 if it is obvious.

So depending on context, someone might simply say:

• 母は弁当箱に卵焼きを入れて、渡しました。

If the listener already knows who received it, that can be enough.

However, 私に is included here to make the recipient explicit:

• to me

This is especially helpful for learners because it clearly shows how 渡す works with に.