صاحبتي بتشرح لي الدرس كويس.

صاحبتي means my female friend in many contexts.

It is made of:

• صاحبة = female friend / companion
• ـي = my

So literally it is my female friend.

Depending on context, صاحبتي can also mean my girlfriend, because colloquial Arabic often uses صاحب / صاحبة for a boyfriend/girlfriend too. Context tells you which meaning is intended.

In Egyptian Arabic, بـ often marks the present tense in everyday speech.

So:

• تشرح = explain / she explain(s) in a more basic or non-colloquial-style form
• بتشرح = she explains / she is explaining in Egyptian colloquial

In this sentence, بتشرح means she explains or she’s explaining, depending on context.

By itself, بتشرح can sometimes be ambiguous, because forms with تـ can relate to different persons in Arabic.

But here the subject is clearly stated:

• صاحبتي = my female friend

So the verb is understood as she explains.

Also, the verb agrees with the feminine subject:

• هو بيشرح = he explains
• هي بتشرح = she explains

Because صاحبتي refers to a female person.

In Arabic, verbs agree with the gender of the subject. So since صاحبتي is feminine, the sentence uses the feminine form:

• بتشرح = she explains

If the subject were masculine, you would say:

• صاحبي بيشرح لي الدرس كويس = my male friend explains the lesson to me well

لي here means to me.

So:

• بتشرح لي = she explains to me

This is the indirect object part of the sentence.

In Egyptian Arabic, you may also hear this pronounced very smoothly together with the verb, almost like:

• بتشرحلي

That is very natural in speech and informal writing.

Because شرح takes the person as an indirect object, not a direct object, in this meaning.

So Arabic uses:

• بتشرح لي الدرس = she explains the lesson to me

Not:

• بتشرحني الدرس

That would not mean the same thing.

Think of it like:

• the lesson = the thing being explained
• to me = the person receiving the explanation

الدرس means the lesson.

The الـ makes it definite:

• درس = a lesson
• الدرس = the lesson

In context, this usually means a specific lesson already known to the speaker and listener, which is very natural.

كويس means good or well, depending on context.

In this sentence, it functions like an adverb:

• بتشرح لي الدرس كويس = she explains the lesson to me well

This is very common in Egyptian Arabic. Words that are adjectives in English-style thinking are often used adverbially in colloquial Arabic.

So even though كويس literally feels like good, the sentence means well.

Yes, very normal.

The sentence is:

• صاحبتي بتشرح لي الدرس كويس

This is a common Egyptian pattern:

• subject + verb + object + adverb

Literally:

• my female friend + explains to me + the lesson + well

Arabic can also use different word orders, but this one is very natural and straightforward in conversation.

A natural Egyptian-style pronunciation would be something like:

• Saḥbti bitishraḥli d-dars kwayyis.

A few notes:

• صاحبتي is often pronounced closer to saḥbti
• بتشرح لي is often said smoothly as bitishraḥli
• الدرس is pronounced id-dars or ed-dars in Egyptian speech, because د is a sun letter, so the ل in الـ assimilates
• كويس is often pronounced kwayyis

Because د is a sun letter.

With sun letters, the ل of الـ is not fully pronounced, and the following consonant is doubled in pronunciation.

So:

• الدرس is pronounced more like
• ed-dars / id-dars

This is a pronunciation rule, not a spelling change. It is still written الدرس.

Yes. In informal writing, many people would write:

• بتشرحلي

instead of

• بتشرح لي

Both represent the same meaning:

• she explains to me

Writing them together reflects how naturally they run together in speech.

A more formal version could be:

• صديقتي تشرح لي الدرس جيدًا

Main differences:

• صديقتي is more standard/formal than صاحبتي
• تشرح instead of بتشرح
• جيدًا instead of كويس

The Egyptian sentence is the natural everyday spoken version.