repooto wo hottikisu de matomete kara, sensei ni dasimasita.

を marks the direct object of the verb. In this sentence, レポート is the thing being acted on: it is what the speaker stapled together and submitted.

So:

• レポートをまとめて = put the report together / staple the report together
• レポートを出しました = submitted the report

Even though there are two actions, レポート can be understood as the object for both.

Here, で marks the tool or means used to do something.

So:

• ホッチキスで = with a stapler

This is the same で you see in sentences like:

• はしで食べる = eat with chopsticks
• ペンで書く = write with a pen

In this sentence, it tells you what was used to gather the report pages together.

ホッチキス usually means stapler in Japanese.

So ホッチキスでまとめて means something like:

• put it together with a stapler
• staple it together

This word is a borrowed word, and its sound may feel surprising because it does not resemble modern English stapler. But in Japanese, ホッチキス is the normal everyday word.

まとめて is the て-form of まとめる, which often means:

• to gather
• to put together
• to organize
• to bring into one group

In this sentence, because it is followed by ホッチキスで, the meaning becomes very naturally:

• staple together
• put together into one packet

So レポートをホッチキスでまとめて means staple the report together rather than just organize the report in an abstract sense.

The て-form connects actions. Here it links the first action to から:

• まとめてから = after putting it together / after stapling it

So the structure is:

• Verb in て-form + から
• meaning after doing ...

It shows that one action happened first, and the next action happened afterward.

〜てから means after doing ... and clearly emphasizes sequence.

So:

• まとめてから、先生に出しました = After stapling it together, I submitted it to the teacher.

If you used only て:

• まとめて、先生に出しました

that can also connect the actions, but 〜てから more clearly highlights first this, then that.

So 〜てから is especially useful when order matters.

に marks the target/recipient of the action 出す here.

So:

• 先生に出しました = submitted it to the teacher

The report is the thing being submitted, and the teacher is the person it is submitted to.

A helpful way to see the roles:

• レポートを = the thing submitted
• 先生に = the person receiving it

Yes, 出す has a basic meaning of to put out / take out / send out, but it has several common extended meanings.

In school or work contexts, 出す can mean:

• to hand in
• to submit
• to turn in

So 先生に出しました naturally means:

• I submitted it to the teacher
• I handed it in to the teacher

This is a very common use.

Both are possible, but they feel a little different.

• 出しました = common, everyday, natural
• 提出しました = more formal, more explicitly submitted

So this sentence sounds like normal spoken or simple written Japanese. If you said:

• レポートをホッチキスでまとめてから、先生に提出しました。

that would also be correct, but slightly more formal or official in tone.

Yes, the subject is omitted, which is very common in Japanese.

The sentence does not explicitly say I, but the natural interpretation is often:

• I stapled the report together and then submitted it to the teacher.

Japanese often leaves out subjects when they are obvious from context. So if this were part of a conversation about your homework, the listener would naturally understand who did it.

Japanese usually places details before the main verb. So the sentence builds up step by step:

1. レポートを — the report
2. ホッチキスで — with a stapler
3. まとめてから — after stapling/putting it together
4. 先生に — to the teacher
5. 出しました — submitted

The final verb comes at the end, which is normal in Japanese.

Grammatically, まとめる itself is broader than to staple, so by itself it could mean organize or put together. But in this sentence, ホッチキスで strongly guides the meaning.

Because a stapler is the tool, the natural interpretation is:

• stapled the report together
• put the report together with a stapler

So in real usage, people would understand it as stapled.

Not in this sentence.

から can mean because in some contexts, but here it comes after the て-form of a verb:

• まとめてから

That pattern specifically means after doing something.

So here it is definitely:

• after stapling it together

not:

• because I stapled it together

Yes, that would be very natural.

• レポートをホッチキスでまとめてから、先生に出しました。
• レポートをホッチキスでまとめたあとで、先生に出しました。

Both mean After stapling the report together, I submitted it to the teacher.

The nuance is very similar. 〜てから is very common and simple, while 〜たあとで can feel slightly more explicit as after that action.

In a school context, yes, very naturally.

On its own, 出す is broad, so 先生に出す could theoretically mean show to the teacher, hand to the teacher, or submit to the teacher depending on context. But with レポート, the most natural meaning is clearly:

• submit the report to the teacher

So the noun レポート helps fix the meaning of 出す here.