اگر حتما میخواهی بیایی، لطفا زود تماس بگیر.

اگر means if. It introduces the condition, just like in English.

So the sentence has two parts:

• اگر حتما می‌خواهی بیایی = the condition
• لطفا زود تماس بگیر = the main request

Persian often builds if-clause + main clause in a very similar way to English.

حتما / حتماً means something like definitely, certainly, or really.

In this sentence, it adds emphasis: not just if you want to come, but if you really/definitely want to come.

About the spelling:

• حتماً is the more traditional spelling
• حتما is very common in everyday typing

Both are understood the same way in modern Persian.

The more standard spelling is می‌خواهی with a half-space (technically a zero-width non-joiner) after می.

So:

• standard: می‌خواهی
• common casual typing: میخواهی

Both are common, but if you are learning standard written Persian, می‌خواهی is the form to remember.

Because after خواستن (to want), Persian normally uses the subjunctive form of the next verb.

So:

• می‌خواهی بیایی = you want to come
• می‌آیی = you come / you are coming

That is why بیایی is used here. It is not describing a present action; it is the verb form needed after want.

Yes. بیایی is the present subjunctive, second person singular, of آمدن (to come).

A very useful pattern is:

• می‌خواهم بروم = I want to go
• می‌خواهی بیایی = you want to come
• می‌خواهند ببینند = they want to see

So if you see خواستن followed by another verb with بـ, that is often this pattern.

The بـ prefix is a common marker in Persian, but it does different jobs in different forms.

Here:

• in بیایی, it helps form the subjunctive
• in بگیر, it helps form the positive imperative (take / get / do it)

So it does not have one simple English translation by itself. It is mainly a grammatical marker.

Because Persian often uses compound verbs: a noun + a light verb.

Here:

• تماس = contact
• گرفتن = to take

Together, تماس گرفتن means to contact / to call / to get in touch.

So تماس بگیر is the informal singular imperative: call / get in touch.

This kind of structure is extremely common in Persian.

زود can mean early, soon, or quickly, depending on context.

In this sentence, it most likely means early or soon:

• call early
• call soon

It does not mainly mean do the act of calling fast. It means don’t wait too long before calling.

Yes. It is addressed to one person informally.

You can tell because of:

• می‌خواهی = informal singular you want
• بیایی = informal singular subjunctive
• بگیر = informal singular imperative

So this is suitable for a friend, someone younger, or someone you speak to casually.

You would change the second-person forms to the formal/plural forms:

اگر حتما می‌خواهید بیایید، لطفا زود تماس بگیرید.

The changes are:

• می‌خواهی → می‌خواهید
• بیایی → بیایید
• بگیر → بگیرید

This version is appropriate for polite speech or for addressing more than one person.

لطفا means please.

In this sentence, it is placed naturally before the request:

• لطفا زود تماس بگیر

That is a very normal position. You can also put it at the beginning of the whole sentence, but the version you have is very natural.

It is not always strictly necessary in Persian, especially in casual speech, but it makes the request softer and more polite.

In casual speech, people often shorten several parts:

• اگر → اگه
• می‌خواهی → می‌خوای
• بیایی → بیای

So a more conversational version could be:

اگه حتما می‌خوای بیای، لطفا زود تماس بگیر.

You might also hear زنگ بزن instead of تماس بگیر in everyday speech, especially when the meaning is specifically call me / call someone on the phone.

Persian word order is somewhat flexible, but the version you have is very natural.

This order works well because:

• the condition comes first: اگر...
• the polite request follows: لطفا زود تماس بگیر

You can sometimes move words like لطفا or حتما, but not every rearrangement sounds equally natural. For a learner, this sentence is a good standard model to follow.