من و خواهرم هر روز با هم درس میخوانیم.

Yes. من و خواهرم literally means I and my sister.

• من = I
• و = and
• خواهرم = my sister

In natural English, we usually say my sister and I, but in Persian, من و خواهرم is completely normal.

Persian does not follow English etiquette rules about always putting yourself second in coordinated subjects.

خواهرم is made of:

• خواهر = sister
• ـم = my

So:

• خواهرم = my sister

This ـم is an attached possessive ending. You will see the same pattern in many words:

• کتابم = my book
• دوستم = my friend
• برادرم = my brother

هر روز means every day.

• هر = every
• روز = day

So literally it is every day.

It is written as two words in Persian, just like in English when you mean each day. It is not the adjective everyday meaning ordinary.

با هم means together.

Literally:

• با = with
• هم = each other / together

So با هم is a very common expression meaning together.

In this sentence, it shows that I and my sister study together.

This is a very common Persian pattern.

درس خواندن literally means to read lesson(s), but idiomatically it means to study.

So in this sentence:

• درس = lesson / study material
• میخوانیم = we read / we study

Together, درس میخوانیم means we study.

This is one of those combinations you should learn as a unit:

• درس خواندن = to study

میخوانیم means we read / we study here.

Its parts are:

• میـ = present/imperfective marker
• خوان = present stem of خواندن
• ـیم = we

So:

• می‌خوانیم = we read / we are reading / we study

In this sentence, because of هر روز, it has a habitual meaning:

• we study every day

Exactly. The subject is من و خواهرم = I and my sister, so the subject is plural: we.

That is why the verb ends in ـیم, the ending for we.

Compare:

• می‌خوانم = I study
• می‌خوانی = you study
• می‌خواند = he/she studies
• می‌خوانیم = we study

The standard spelling is می‌خوانیم with a نیم‌فاصله, or zero-width non-joiner.

So the most standard written form is:

• من و خواهرم هر روز با هم درس می‌خوانیم.

But many people type it without the نیم‌فاصله:

• میخوانیم

You will see both, especially in informal typing. Learners should recognize both, but it is best to write می‌خوانیم in careful Persian.

No, not here.

In خواندن and می‌خوانیم, the و is not pronounced as v. It is part of the long vowel sound.

A rough pronunciation is:

• mi-khâ-nim

So می‌خوانیم sounds approximately like mee-KHAA-neem.

The خ is the throaty sound also heard in words like the German Bach or Scottish loch.

Persian word order is flexible, but this sentence follows a very natural pattern:

• subject: من و خواهرم
• time: هر روز
• manner: با هم
• object/complement: درس
• verb: می‌خوانیم

The most important thing is that the verb usually comes at the end.

You can move هر روز around for emphasis, for example:

• من و خواهرم با هم هر روز درس می‌خوانیم
• هر روز من و خواهرم با هم درس می‌خوانیم

But the given version is very normal and natural.

Normally, no. If you remove من, the sentence becomes confusing.

The verb می‌خوانیم already tells us we, but خواهرم by itself means my sister, which is singular. So without من, the listener may need to guess who the other person is.

That is why من و خواهرم is clearer and more natural.

If the context already made it obvious, Persian can omit pronouns, but in this sentence the full subject is the best choice.

Because درس خواندن is usually treated as a fixed expression meaning to study.

In this kind of use, درس is not behaving like a specific direct object that needs را.

So:

• درس می‌خوانیم = we study

If you were talking about a specific lesson or a specific book, the structure might be different. But in the common expression درس خواندن, no را is used.

Literally, yes, the pieces suggest something like we read lesson material. But in normal Persian, درس خواندن is the standard expression for studying.

So the natural translation is:

• My sister and I study together every day.

A learner should understand درس خواندن as an idiomatic verb phrase, not translate it word-for-word every time.

Yes. In speech, و meaning and is very often pronounced o.

So:

• من و خواهرم

is often pronounced roughly as:

• man o khâharam

This is very normal in spoken Persian.

It is neutral and completely natural in both everyday speech and standard writing.

The only small point is spelling:

• In careful writing, می‌خوانیم is preferred.
• In casual typing, many people write میخوانیم.

But the sentence itself is not slangy or unusually formal. It is a standard everyday Persian sentence.