tento to pegu wo motte kita no ha dare da kke?

Because テント と ペグ is being treated as one combined object: tent and pegs.

In Japanese, when two nouns are joined by と meaning and, you usually put the object particle only once, after the whole list:

• テントとペグを持って来た
• literally: brought the tent and pegs

You do not need to say テントをペグを here.

Here, と means and. It connects the two nouns:

• テント = tent
• ペグ = pegs / tent stakes
• テント と ペグ = tent and pegs

This と is the standard particle for joining nouns in a complete list.

持って来た means brought.

It comes from:

• 持つ = to hold, to carry
• 来る = to come

In this pattern, 持って来る means to bring, literally something like to come carrying.

So:

• 持って来た = brought / came carrying

This is a very common way Japanese expresses bring.

Japanese often expresses ideas like bring by combining verbs.

• 持つ = carry
• 来る = come
• 持って来る = bring

The て-form of 持つ is 持って, which links it to 来る.

So the structure is:

• 持って来る = to bring
• 持って来た = brought

This is normal Japanese, not an unusual construction.

の turns the verb phrase into something noun-like, and は marks it as the topic.

So:

• テントとペグを持って来た = brought the tent and pegs
• テントとペグを持って来たの = the one who brought the tent and pegs / the act of bringing the tent and pegs
• テントとペグを持って来たのは = as for the one who brought the tent and pegs...

In this sentence, it sets up the question:

• テントとペグを持って来たのはだれだっけ？
• Who was it that brought the tent and pegs again?

This pattern is very common for asking who did X?

Yes, but the nuance matters.

Because of だっけ, the speaker is not usually asking for brand-new information. They are trying to remember something they were told before.

So a more natural sense is:

• Who was it that brought the tent and pegs again?
• Wait, who brought the tent and pegs?
• Who brought the tent and pegs, again?

The again here is the English memory-refreshing again, not repetition of the action.

だっけ is an informal expression used when trying to recall something.

It often gives a feeling like:

• What was it again?
• Who was it again?
• Remind me...
• I’m trying to remember...

So:

• だれだっけ？ = Who was it again?

It sounds casual and conversational.

They are quite different in nuance.

• だれ？ = Who?

  • very direct
  • asks for information plainly

• だれだっけ？ = Who was it again?

  • suggests the speaker once knew
  • is trying to remember
  • has a softer, more self-directed feeling

So in this sentence, だっけ shows that the speaker is searching their memory, not simply asking from zero.

Yes, だっけ is casual.

A more polite version would be something like:

• テントとペグを持って来たのはだれでしたっけ？

That sounds more polite and appropriate in formal situations.

Very casual:

• だれだっけ？

More polite:

• だれでしたっけ？

Both have the trying to remember nuance.

Because the sentence uses the pattern:

• [verb phrase] のは だれ ...

This structure means:

• As for the person who did [verb phrase], who was it?

So だれ comes after のは as the thing being identified.

Compare:

• テントとペグを持って来たのはだれ？ = Who is the one that brought the tent and pegs?

This is a very natural pattern in Japanese. You do not need が before だれ here.

Because the bringing already happened.

• 来た is past tense of 来る
• 持って来た = brought

The speaker is asking about a completed action in the past:

• Who brought the tent and pegs?

The だっけ part is about the speaker’s memory now, but the action itself is past.

Yes. They mean the same thing.

• 持って来た
• 持ってきた

The second one just writes 来た in hiragana instead of kanji.

In everyday writing, you will often see 持ってきた. In teaching materials, mixed kanji and kana like 持って来た is also common.

The spaces are almost certainly just for learners.

Normal Japanese is usually written without spaces:

• テントとペグを持って来たのはだれだっけ？

The spaces in your sentence are there to make the grammar easier to see:

• テント
• と
• ペグ
• を
• 持って
• 来た
• の
• は
• だれ
• だ
• っけ

They are not normally written that way in standard Japanese text.

Here, の is not the possession particle like in 私の本.

Instead, it is a nominalizer. It turns a clause into something noun-like.

So:

• 持って来た = brought
• 持って来たの = the one that brought / the fact of bringing

In this sentence, it helps create the structure:

• [the one who brought the tent and pegs] is who again?

So this の is grammatical, not possessive.

Yes, ペグ is a loanword from English peg. In camping context, it usually means tent pegs or stakes.

So テント と ペグ naturally means something like:

• the tent and the pegs
• the tent and tent stakes

The camping context makes that interpretation clear.