خواهرم من را به یک جشن دعوت کرد.

A very literal breakdown is:

• خواهرم = my sister
• من را = me (with the object marker)
• به یک جشن = to a party / to a celebration
• دعوت کرد = invited (literally, did an invitation)

So the sentence is structured like:

My sister me to a party invited.

That is normal for Persian, because Persian usually puts the verb at the end.

The word خواهر means sister.

The -م attached to it is a possessive ending meaning my.

So:

• خواهر = sister
• خواهرم = my sister

This kind of ending is very common in Persian:

• برادرم = my brother
• دوستم = my friend
• کتابم = my book

را is the direct object marker in Persian. It often gets written as را and pronounced roughly râ.

In this sentence, من را marks me as the person being invited.

So:

• من = I / me
• من را = me, as the direct object

English does not have an equivalent separate word, so this is often new for learners.

A helpful way to think of it is:

• the subject does the action
• the noun before را receives the action

Here, my sister does the inviting, and me receives the inviting.

Because من by itself can mean I or me, depending on context. Persian uses را to make it clear that this is the direct object.

So:

• من = I / me
• من را = me

Without را, the sentence would sound incomplete or ungrammatical in standard Persian if you want من to be the object.

Because the verb pattern is:

کسی را به جایی / چیزی دعوت کردن
= to invite someone to a place / event

So Persian uses به for the destination or event of the invitation.

Examples:

• او مرا به خانه دعوت کرد = He invited me to his house.
• او مرا به شام دعوت کرد = He invited me to dinner.
• او مرا به جشن دعوت کرد = He invited me to a party.

So به here is functioning like to in English.

یک usually means one, but it is also commonly used like a/an in English.

So:

• یک جشن = a party / a celebration

In this sentence, it does not strongly emphasize the number one. It just makes the noun indefinite, like English a party.

Yes, sometimes it can.

For example:

• به جشن دعوت کرد can still mean invited me to a party / the party, depending on context.

But یک جشن clearly gives the sense of a certain party, some party in an indefinite way.

Persian often leaves things more context-dependent than English, so both forms can be possible, but یک جشن is a straightforward match for a party.

It is a compound verb, which is extremely common in Persian.

It consists of:

• دعوت = invitation / inviting
• کرد = did

Together, دعوت کرد means invited.

This is one of many Persian compound verbs built with a noun or verbal element plus کردن.

Other examples:

• فکر کرد = thought
• شروع کرد = started
• تماس گرفت = contacted / got in touch

So even though it looks like two words, you should learn دعوت کردن as one vocabulary item meaning to invite.

Because the full infinitive is دعوت کردن = to invite.

In the simple past tense, کرد is the third-person singular form of کردن.

That matches the subject خواهرم = my sister, which is third-person singular.

So:

• من دعوت کردم = I invited
• تو دعوت کردی = you invited
• او دعوت کرد = he/she invited
• خواهرم دعوت کرد = my sister invited

Yes, very often Persian allows that, especially when the meaning is already clear.

A very natural alternative is:

• خواهرم دعوتم کرد = My sister invited me

Here, -م attached to the verb phrase gives the meaning me.

In more colloquial Persian, you may also hear:

• خواهرم منو دعوت کرد
• خواهرم منو به یه جشن دعوت کرد

So the full form من را is correct and clear, but in conversation Persian often uses shorter or more colloquial object forms.

A common spoken version would be:

خواهرم منو به یه جشن دعوت کرد.

Changes:

• من را → منو
• یک → یه

So:

• منو is the colloquial form of من را
• یه is the colloquial form of یک

This is very common in everyday speech.

A careful pronunciation is roughly:

khâharam man râ be yek jashn da'vat kard

A more natural colloquial pronunciation might sound like:

khâharam mano be ye jashn da'vat kard

A few notes:

• خواهرم = khâharam
• را is often pronounced râ
• یک often sounds like yek in careful speech, but ye in conversation
• دعوت is usually pronounced something like da'vat

Not exactly.

جشن often means celebration, festival, or party, especially when there is some special occasion.

Another very common word is مهمانی, which often means party, gathering, or guest event in a more general sense.

So:

• جشن = celebration / party
• مهمانی = party / gathering

Depending on context, English party could be translated by either one.

Because Persian normally follows Subject–Object–Verb order.

This sentence is:

• خواهرم = subject
• من را = object
• به یک جشن = prepositional phrase
• دعوت کرد = verb

So the verb naturally comes last.

That is one of the biggest sentence-order differences between Persian and English.