كل شيء بخير.

A careful MSA pronunciation is:

kullu shay’in bikhayr(in)

In normal unvocalized writing, you usually see:

كل شيء بخير

A few pronunciation notes:

• كل = kull
• شيء = shay’ or shay’un / shay’in depending on case ending
• بخير = bi-khayr

In pause, many final short vowels are dropped, so in real speech you will often hear something close to:

kull shay’ bikhayr

Because Arabic usually does not use a present-tense form of to be in simple sentences like this.

So:

• كل شيء بخير = Everything is fine

This is a nominal sentence in Arabic: a subject plus a predicate, with no present-tense is/are stated.

Grammatically:

• كل شيء = the subject
• بخير = the predicate

If you wanted a past or future meaning, Arabic would use an actual verb, such as كان.

Because كل already means all / every, and here it forms a fixed grammatical construction with the noun after it.

كل شيء literally works like:

• كل = every / all
• شيء = thing

Together: every thing → everything

You normally do not say الكل شيء in MSA for this meaning.

Also, كل here is the first part of an iḍāfa construction (a possessive/genitive construction), so it directly links to the following noun.

It is an iḍāfa construction.

That means:

• كل is the first term (muḍāf)
• شيء is the second term (muḍāf ilayh)

In full case-marked form, it is:

كلُّ شيءٍ

Why?

• كلُّ is nominative here because the whole phrase is the subject of the sentence.
• شيءٍ is genitive because it is the second part of the iḍāfa.

Important detail:

• كل does not take ال here.
• As a muḍāf, كل also does not take tanwīn.

Good question. In Arabic, كل شيء is the normal idiomatic way to say everything.

Even though English uses the definite-looking word everything, Arabic does not express it as كل الشيء here.

Instead, Arabic uses:

• كل شيء = everything
• literally: every thing

So the noun شيء stays without ال in this standard expression.

With full vowel endings, the sentence is usually:

كُلُّ شَيْءٍ بِخَيْرٍ

Breakdown:

• كُلُّ — nominative (-u) because it is the subject
• شَيْءٍ — genitive (-in) because it is the second part of the iḍāfa
• بِخَيْرٍ — genitive (-in) because بـ is a preposition, and prepositions make the following noun genitive

In ordinary writing, these short vowels are usually omitted.

Because Arabic commonly uses the preposition بـ with words like خير in expressions of condition or state.

So:

• بخير = in a good state / well / fine

This is extremely common in greetings and replies, for example:

• أنا بخير = I am fine
• نحن بخير = We are fine
• كل شيء بخير = Everything is fine

If you said just خير, that would not sound like the normal expression here.

Not exactly. It is a prepositional phrase:

• بـ = in / with
• خير = good, goodness, well-being

So grammatically, بخير is not a plain adjective like جيد. It functions as the predicate of the sentence and describes the state of the subject.

That is one reason Arabic learners should think of it as a set expression: to be fine / well = أن يكون بخير in effect, though no present-tense verb is written.

شيء is spelled with a final hamza: ء.

The word is:

• ش ي ء
• pronounced roughly shay’

The hamza represents a glottal stop, a little catch in the throat. So it is not exactly shay; it is shay’.

In careful reading with case endings, you may hear:

• shay’un
• shay’an
• shay’in

depending on the grammar of the sentence.

This word often confuses learners because the spelling is a bit unusual, but it is very common and worth memorizing exactly as written: شيء.

Because كل itself is used with both masculine and feminine nouns.

Here the noun is شيء, which is grammatically masculine anyway, but the key point is that كل does not have separate masculine and feminine forms like many adjectives do.

Examples:

• كل شيء = everything
• كل امرأة = every woman
• كل رجل = every man

So you just use كل.

Yes, depending on context.

Very often, كل شيء simply means everything as one natural phrase.

But literally, it is also every thing. Arabic often uses this structure where English uses an indefinite pronoun like everything, everyone, etc.

So context determines whether you should think of it as:

• a literal phrase: every thing
• or the idiomatic English equivalent: everything

Yes, it is very common and natural.

كل شيء بخير is a normal way to say that things are fine.

Some related expressions are:

• أنا بخير = I’m fine
• نحن بخير = We’re fine
• كل شيء على ما يرام = Everything is okay / Everything is going well
• الأمور بخير = Things are fine

Among these, كل شيء بخير is short, clear, and very useful for learners.

Yes, absolutely.

It works well as a reply to questions like:

• كيف الحال؟ = How are things?
• كيف الأمور؟ = How are things going?

Then you can answer:

• كل شيء بخير = Everything is fine

It sounds a bit broader than just أنا بخير, because it refers to the general situation, not only to you personally.