هذا قلب.

A careful MSA pronunciation is:

hādhā qalbun

In normal pause at the end of the sentence, it is usually pronounced:

hādhā qalb

A few notes:

• هذا = hādhā
• قلب = qalb
• The letter ق is pronounced q, a deeper sound than English k
• The ذ in هذا sounds like the th in this

So the whole sentence is roughly:

hā-dhā qalb

هذا means this for a masculine singular noun.

So in هذا قلب, هذا is pointing to one masculine thing: this.

Arabic demonstratives change depending on gender and number. For example:

• هذا = this (masculine singular)
• هذه = this (feminine singular)

Since قلب is a masculine noun, هذا is the correct form here.

In Arabic, present-tense sentences like This is a heart often do not use a separate word for is.

So:

• هذا قلب literally looks like this heart
• but it means This is a heart

This is completely normal in Arabic. The linking verb is/am/are is usually understood in the present tense.

If you want past or future, Arabic does use other words, but in simple present statements it often leaves is unstated.

قلب means heart.

It is pronounced qalb.

A few pronunciation points:

• ق = q, pronounced farther back in the mouth than k
• ل = l
• ب = b

The word is short, but the first consonant ق can be tricky for English speakers because English does not normally have this exact sound.

Because قلب is grammatically masculine in Arabic.

In Arabic, nouns have grammatical gender, and words like this must agree with that gender.

So:

• هذا قلب = This is a heart
• هذه سيارة = This is a car

Even if an object has no biological sex, Arabic still assigns it a grammatical gender. قلب happens to be masculine, so هذا is used.

Because قلب here is indefinite.

• قلب = a heart
• القلب = the heart

So:

• هذا قلب = This is a heart
• هذا القلب = This is the heart

That small difference is very important. Adding الـ makes the noun definite.

Normally, no. هذا قلب is understood as This is a heart because قلب is indefinite.

If you want This is the heart, you would usually say:

هذا القلب

So the presence or absence of الـ changes the meaning:

• هذا قلب = This is a heart
• هذا القلب = This is the heart

In fully vocalized Arabic, this sentence would typically be written:

هٰذا قَلْبٌ

That final ٌ is called tanwīn, and here it marks an indefinite nominative noun: qalbun.

But in everyday Arabic writing, short vowels and tanwīn are usually omitted, so you often just see:

هذا قلب

Also, when pausing at the end of a sentence, speakers usually do not pronounce the final -un, so qalbun becomes qalb in actual speech.

This is a simple nominal sentence in Arabic.

A common analysis is:

• هذا = the topic/subject, meaning this
• قلب = the predicate, telling you what this is

So the structure is basically:

this + heart

which in natural English becomes:

This is a heart

In traditional Arabic grammar, both parts are in the nominative role in this kind of sentence.

Because the sentence is not just a noun phrase like this heart. It is a complete sentence meaning This is a heart.

Compare:

• هذا قلب = This is a heart
• هذا القلب = this heart or this is the heart, depending on context

Arabic often uses the demonstrative first in simple identification sentences. So هذا introduces what you are pointing at, and قلب tells what it is.

You would change هذا to هذه.

For example:

• هذا كتاب = This is a book
• هذه سيارة = This is a car

So the pattern is:

• هذا + masculine noun
• هذه + feminine noun

Since قلب is masculine, the original sentence correctly uses هذا.

Yes. هذا is a very common word, but its spelling does not perfectly show all of its pronunciation for beginners.

It is pronounced hādhā, with a long ā sound after h and again at the end.

In some fully vocalized texts, you may see a small dagger alif over the ه, like this:

هٰذا

That helps show the long vowel. But many texts simply write:

هذا

So learners usually just memorize this very common word as hādhā.

At the end of a sentence, Arabic usually has pause pronunciation.

So although the fully inflected form is:

hādhā qalbun

when stopping, you usually say:

hādhā qalb

This is very common in Arabic:

• grammatical endings may exist in full grammar
• but in pause, the final short vowel or tanwīn is often dropped in pronunciation

That is why learners may see one thing in grammar explanations and hear a slightly shorter form in actual speech.