يعجن صديقي الطين.

A careful MSA pronunciation is:

yaʿjinu ṣadīqī aṭ-ṭīna

A few notes:

• ʿ represents ع, a deep throat sound with no exact English equivalent.
• ṣ represents ص, an emphatic s.
• ṭ represents ط, an emphatic t.
• ī is a long ee sound.
• الطين is written with الـ, but pronounced aṭ-ṭīn because ط is a sun letter, so the l sound of al- assimilates.

If you stop at the end of the sentence, you will often hear:

yaʿjinu ṣadīqī aṭ-ṭīn

with the final short vowel dropped in pause.

The sentence is:

• يعجن = verb
• صديقي = subject
• الطين = object

So the structure is:

Verb + Subject + Object

This is very common in Arabic, especially in formal written Arabic and MSA verbal sentences.

In Arabic, a sentence that describes an action often begins with the verb. That is called a verbal sentence.

So:

• يعجن صديقي الطين = a normal verbal sentence
• literally: kneads my friend the clay

English usually prefers Subject + Verb + Object, but Arabic very often uses Verb + Subject + Object.

يعجن is the imperfect form of the verb عجن, meaning to knead.

Here it is:

• 3rd person
• masculine
• singular

So it means he kneads, he is kneading, or sometimes he kneads regularly, depending on context.

In MSA, the imperfect can express:

• a present action
• a habitual action
• sometimes a near future meaning, depending on context

The prefix يـ is part of the imperfect verb pattern and here marks 3rd person masculine singular.

So:

• يعجن = he kneads
• if the subject were feminine, it would become تعجن = she kneads

This prefix is one of the key signals learners use to identify who is doing the action.

صديقي means my friend.

Breakdown:

• صديق = friend
• ـي = my

So the final ـي is a possessive suffix attached directly to the noun.

This is how Arabic usually says my, your, his, etc. with nouns:

• كتابي = my book
• بيتي = my house
• صديقي = my friend

Yes. صديق is the masculine form of friend.

So:

• صديقي = my male friend
• صديقتي = my female friend

Also, the verb يعجن is masculine singular, which matches صديقي.

If the subject were my female friend, the sentence would be:

تعجن صديقتي الطين

Because in a normal Arabic verbal sentence, the subject often comes after the verb.

So this order is perfectly natural:

• يعجن صديقي الطين

If you put the subject first:

• صديقي يعجن الطين

that is also correct, but it gives the sentence a slightly different feel, often with more focus on my friend.

Yes. That is also correct.

Compare:

• يعجن صديقي الطين = neutral verbal sentence, very natural in MSA
• صديقي يعجن الطين = subject-first; often feels a bit more emphatic about my friend

Both mean the same basic thing.

Because ط is a sun letter.

In Arabic, when الـ comes before a sun letter, the l sound is not pronounced. Instead, the following consonant is doubled.

So:

• written: الطين
• pronounced: aṭ-ṭīn

In fully vocalized Arabic, you would see a shadda on ط to show this doubling:

الطِّين

This is a very common pronunciation rule in Arabic.

الطين means the clay, but in Arabic الـ can also be used where English might simply say clay in a general or known sense.

So الطين could refer to:

• a specific clay already known in the context
• clay as a material, in a general sense

If you wanted an indefinite meaning like some clay, you could say:

طينًا

But in many natural Arabic sentences, الطين is very normal.

In full grammatical terms:

• صديقي is the subject, so it is nominative
• الطين is the direct object, so it is accusative

A fully vocalized version is:

يَعْجِنُ صَدِيقِي الطِّينَ

Notes:

• يَعْجِنُ ends in -u
• الطِّينَ ends in -a because it is the direct object
• with صديقي, the case ending is not clearly shown at the end because of the attached -ī suffix

In normal unvocalized writing, these short vowels are usually not written.

Because both nouns are definite.

• صديقي is definite because it has the possessive suffix -ي = my
• الطين is definite because it has the definite article الـ

Tanwīn usually appears on indefinite nouns, not definite ones.

So you would not expect tanwīn here.

It can mean either, depending on context.

The Arabic imperfect here can correspond to:

• kneads
• is kneading

For example:

• as a general fact or habit: my friend kneads clay
• as something happening now: my friend is kneading the clay

Arabic often leaves that distinction to context, whereas English usually chooses one form more explicitly.

Yes, but Arabic has an important pattern here.

If the verb comes first, Arabic often keeps the verb in the singular even when the subject after it is plural:

• يعجن أصدقائي الطين = my friends knead the clay

But if the subject comes first, full agreement is used:

• أصدقائي يعجنون الطين

This is a classic feature of standard Arabic word order.