Завтра у нас будет диктант, поэтому я хочу ещё раз повторить ударные и безударные слоги.

This is a very common Russian pattern.

У нас будет диктант literally means something like At our place / for us there will be a dictation. In natural English, we translate it as We will have a dictation tomorrow.

Russian often uses у + genitive to express possession or something associated with a person:

• У меня есть книга = I have a book
• У нас будет экзамен = We will have an exam

So у нас будет диктант is the normal, natural way to say we have a dictation coming up.

It is genitive.

The preposition у normally requires the genitive case, so:

• я → меня
• ты → тебя
• мы → нас
• они → них

That is why it is у нас, not у мы.

Будет is the future tense of быть for he/she/it.

Since the sentence begins with Завтра (tomorrow), the event is in the future:

• У нас есть диктант = We have a dictation / There is a dictation for us
• У нас будет диктант = We will have a dictation

Here диктант is singular, so Russian uses singular будет.

Диктант is a dictation exercise. A teacher reads a text aloud, and students write it down.

This is a very common school activity in Russian-speaking countries, especially in language classes. It often tests:

• spelling
• punctuation
• listening
• knowledge of stress and vowel reduction

So in this sentence, the speaker is preparing for a school-style dictation.

Поэтому means therefore, so, or that’s why.

It connects the two parts of the sentence:

• Tomorrow we have a dictation
• therefore / so I want to review...

So the logic is: Завтра у нас будет диктант, поэтому я хочу... = Tomorrow we have a dictation, so I want...

It is a very common connector for showing result or consequence.

Because after хотеть (to want), Russian normally uses an infinitive to say what someone wants to do.

So:

• Я хочу читать = I want to read
• Я хочу спать = I want to sleep
• Я хочу повторить = I want to review / repeat

This is similar to English want to do something.

Ещё раз means once more, one more time, or simply again.

In this sentence:

• повторить ещё раз = to review one more time

It suggests the speaker has probably studied this already and wants one additional review before the dictation.

A few examples:

• Скажи ещё раз. = Say it again.
• Прочитаю ещё раз. = I’ll read it one more time.

These words are in the accusative plural, because they are the direct object of повторить.

The speaker wants to review what?

• ударные и безударные слоги

However, because слоги is inanimate plural, the accusative plural looks exactly like the nominative plural.

So:

• nominative plural: ударные и безударные слоги
• accusative plural: ударные и безударные слоги

The adjectives match the noun in:

• gender: masculine plural as part of the plural group
• number: plural
• case: accusative

These words describe whether a syllable is stressed.

• ударный = stressed
• безударный = unstressed

So:

• ударные слоги = stressed syllables
• безударные слоги = unstressed syllables

This is especially important in Russian because unstressed vowels are often pronounced differently from how they are written.

This is about aspect.

• повторять = imperfective
• повторить = perfective

Here the speaker wants to do the review as a single completed action, probably before the dictation tomorrow. That is why повторить is natural.

Compare:

• Я хочу повторить правило. = I want to review the rule (complete it)
• Я люблю повторять слова. = I like reviewing/repeating words (in general, repeatedly)

So повторить fits the idea of review once and finish.

Yes. Повторить literally means to repeat, but it is also commonly used in the sense of to review material you studied before.

For example:

• повторить слова = review vocabulary
• повторить грамматику = review grammar
• повторить урок = review the lesson

So in this sentence, повторить ударные и безударные слоги means to review stressed and unstressed syllables, not necessarily to say them aloud again and again.

Ещё is pronounced roughly yesh-CHO, with the stress on the final syllable.

The letter ё always shows the sound yo. So:

• е and ё are different letters
• ещё is not pronounced the same as if it were written with plain е

In many printed texts, Russians often write е instead of ё, but in learning materials ё is usually shown because it helps pronunciation.

Russian word order is fairly flexible, but the original order is very natural.

Завтра у нас будет диктант, поэтому я хочу ещё раз повторить ударные и безударные слоги.

This order works well because:

• Завтра sets the time right away
• у нас будет диктант gives the situation
• поэтому introduces the result
• я хочу... gives the speaker’s response

Some parts could be moved for emphasis, but not every change sounds equally natural. For example:

• Поэтому я хочу ещё раз повторить... is normal
• Я хочу ещё раз повторить... could come first in a different context, but then the emphasis changes

So yes, Russian word order can move around, but this sentence is already in a very natural, neutral order.