أتبع التعليمات حتى أنضم إلى الفريق.

A fully vowelized version is:

أَتَّبِعُ التَّعْلِيماتِ حَتّى أَنْضَمَّ إِلَى الفَرِيقِ.

A helpful pronunciation guide is:

ʾattabiʿu at-taʿlīmāti ḥattā ʾanḍamma ʾilā al-farīqi

Two useful pronunciation notes:

• In التعليمات, the ل of الـ is not pronounced, because ت is a sun letter, so it sounds like at-taʿlīmāt.
• In الفريق, the ل is pronounced, because ف is a moon letter, so it sounds like al-farīq.

Here أتبع is the 1st person singular imperfect form of اتّبع.

So the dictionary form is:

اتّبع = to follow

And the form in the sentence is:

أَتَّبِعُ = I follow

This is a very common verb in MSA for following instructions, rules, advice, a method, etc.

A learner may confuse it with other similar-looking forms from the same root, but here the intended form is clearly اتّبع / يتّبع.

Arabic often does not need an explicit subject pronoun when the verb already shows the subject.

In أتبع, the prefix أَ- tells you the subject is I.

So:

• أتبع = I follow
• أنضم = I join / I become part of

You could say أنا أتبع التعليمات..., but أنا is not necessary unless you want extra emphasis.

التعليمات is a sound feminine plural. Its singular is تعليمة or sometimes a related singular is understood from context, but in practice تعليمات is very common as the word for instructions.

In this sentence, التعليمات is the direct object of أتبع.

Normally, a direct object is accusative. But sound feminine plurals are special:

• nominative: -اتُ
• accusative: -اتِ
• genitive: -اتِ

So here it is:

التعليماتِ

Even though it is a direct object, it takes kasra in the accusative because it is a sound feminine plural.

Here حتى means something like until, so that, or up to the point that, depending on how literally you want to understand it.

In this sentence, it gives a sense of goal or intended result:

• I follow the instructions so that I can join the team.
• I follow the instructions until I join the team.

So حتى links the first action to the final outcome.

أنضم comes from the verb:

انضمّ = to join, to become part of

Its normal 1st person singular imperfect form is:

أَنْضَمُّ = I join / I am joining

But after حتى, when the meaning is future-oriented or expresses purpose/result, the imperfect verb is usually subjunctive.

So:

• indicative: أَنْضَمُّ
• subjunctive: أَنْضَمَّ

Without vowel marks, both are usually written the same way: أنضم

So the spelling does not change, but the grammatical mood does.

Because انضمّ normally takes the preposition إلى.

So the standard pattern is:

انضمّ إلى... = to join ...

Examples:

• انضم إلى الفريق = he joined the team
• أنضم إلى المجموعة = I join the group

So إلى is not optional here in normal MSA usage; it is the usual preposition that goes with this verb.

Because this is a normal verbal sentence in Arabic.

Arabic commonly begins a sentence with the verb:

أتبع التعليمات...

This is completely natural and standard in MSA.

If you want, you can also make the subject explicit:

أنا أتبع التعليمات حتى أنضم إلى الفريق.

That version is also correct, but it sounds slightly more emphatic because أنا is being stated explicitly.

Yes. Depending on the nuance, Arabic could also use expressions like:

• لكي
• لِـ
• من أجل أن

For example:

أتبع التعليمات لكي أنضم إلى الفريق.

This also means I follow the instructions in order to join the team.

The difference is that حتى can carry a slight sense of endpoint or eventual result, while لكي is more straightforwardly in order to. Both are possible, but حتى is perfectly natural here.