يَكُون becomes in Arabic

لَكِن مَقْصُود أهل التَّحْقِيق كالجنيد وَنَحْوه أَن يكون هَذَا التَّوْحِيد للْعَبد خلقا ومقاما

However, what the people of realization, like Al-Junayd and his peers, mean is that this tawhid becomes for the servant a disposition and a station.

يَكُونَ it becomes

The 'be/become' verb in the subjunctive (bare '-a' ending) after 'that'; subject ('it') built in, awaiting its predicate.

From Worship God Alone

فَبَدَأَ الصدّيق بِدُخُولِهِ ليَكُون وقاية لَهُ إِن كَانَ ثَمَّ موذ

So the Truthful One began to enter it to be a protection for him if there was any harm.

لِيَكُونَ to be

'Li-' of purpose fused with a 'to be' verb in the subjunctive (the '-a') — 'in order to be'. The 'li-' gives the aim of entering first; it will set its predicate in the accusative.

From The Night of the Migration

أم يكون التفاته إِلَى من ألبسهُ إِيَّاهَا

Or will he turn towards the giver of these clothes.

يَكُونُ will he be

A present-tense 'to be' verb 'is / will be', subject coming next — 'or will his turning be…'. It sets up its predicate.

From Stages of the Seeker

ورجع السماء هو إعطاء الخير الذي يكون من جهتها حالًا بعد حال على مرور الأزمان

The returning of the sky is the provision of good that comes from it from time to time over the ages.

يَكُونُ it comes

A present-tense verb 'it comes/occurs' with the doer 'it' built in, the subject of the relative clause. Its action ties the good back to the noun the relative pronoun introduced.

From Oaths of Provision

فمن أنكر أن يكون الله قد تكلم بالقرآن فقد أنكر حقيقة الرسالة

So whoever denies that Allah spoke the Quran has denied the essence of the message.

يَكُونَ is

A present-tense form of the verb 'to be', pushed into the subjunctive by the 'that' word before it, so 'that Allah be / have...'. Arabic usually omits 'is/are' in the present, but when a verb of being is needed in such a clause it appears in this mood-marked form.

From God's Eternal Word

فالحب الخلي عَن ذل والذل الخلي عَن حب لَا يكون عبَادَة

For love devoid of humility and humility devoid of love is not worship.

يَكُونُ it is

This is a present-tense verb of being with a built-in 'it' subject, the verb Arabic uses to say something 'is/becomes' a thing. Under the negation it states that the described love or humility does not amount to worship.

From Worship and Repentance

فَجِنْسُ الْمَحَبَّةِ يَكُونُ لِلَّهِ وَلِرَسُولِهِ كَالطَّاعَةِ

So the kind of love is for God and for His Messenger, like obedience.

يَكُونُ he is

This is the present 'to be' verb, here overtly used to link the subject to its predicate, 'is/belongs'. Arabic usually drops 'is', so its presence marks a deliberate framing of the category as standing in a relationship spelled out by the following prepositions.

From Faith and Worship