من فایل های پروژه را دیروز آماده کردم و امروز آنها را چاپ میکنم.

Usually, من is optional.

Persian verbs already show the subject in their endings:

• کردم = I did / I prepared
• می‌کنم = I do / I am doing / I will do

So you could say:

فایل‌های پروژه را دیروز آماده کردم و امروز آن‌ها را چاپ می‌کنم.

Adding من makes the subject more explicit. It can sound slightly more emphatic, clearer, or more natural if you are contrasting with someone else.

را marks a specific direct object.

In this sentence:

• فایل‌های پروژه را = the project files as the object
• آن‌ها را = them as the object

It usually does not get translated as a separate word in English. It just tells you that the noun before it is the thing directly affected by the verb.

So:

• فایل‌های پروژه را آماده کردم = I prepared the project files
• آن‌ها را چاپ می‌کنم = I am printing them / I will print them

If the object were indefinite or nonspecific, را might be omitted.

This phrase is built like this:

• فایل = file
• ها = plural marker
• ـی / ezafe = linker
• پروژه = project

So the full structure is:

فایل‌ها‌ی پروژه = the project files / files of the project

A more standard spelling is:

فایل‌های پروژه

The ezafe links files to project, showing a relationship like of in English.

Because آماده کردن is a compound verb, and compound verbs are extremely common in Persian.

It consists of:

• آماده = ready
• کردن = to do / to make

Together:

• آماده کردن = to prepare / to make ready

In the past:

• آماده کردم = I prepared

So Persian often expresses an idea with:

• a nonverbal element + کردن

This is very common:

• تمیز کردن = to clean
• شروع کردن = to start
• چاپ کردن = to print

Because Persian present tense can also express a planned, near-future action, especially when a time word makes it clear.

Here:

• امروز = today
• چاپ می‌کنم = I print / I am printing / I will print

So in context, امروز چاپ می‌کنم can naturally mean:

• I’m printing them today
• I’ll print them today

This is very normal in Persian.

Yes, Persian can sometimes omit the object if it is already clear from context. But آن‌ها را is perfectly natural here because it makes the sentence clearer and avoids repeating فایل‌های پروژه.

So instead of saying the full noun again, Persian uses:

• آن‌ها را = them

This is similar to English:

• I prepared the project files yesterday and I’m printing them today.

Without آن‌ها را, the sentence could still work in some contexts, but it would sound less explicit.

They mean the same thing: they / those / them depending on context.

The more standard spelling is:

آن‌ها

with a half-space. But many people write:

آنها

without it, especially in casual typing.

In this sentence, because it is followed by را, it means them:

• آن‌ها را = them

Persian usually puts the verb at the end of the clause.

So the first part is:

• من = subject
• فایل‌های پروژه را = object
• دیروز = time
• آماده کردم = verb

And the second part is:

• امروز = time
• آن‌ها را = object
• چاپ می‌کنم = verb

A very common Persian pattern is:

Subject + Object + Time/Other information + Verb

But time expressions are fairly flexible. For example, you could also say:

من دیروز فایل‌های پروژه را آماده کردم...

That still sounds natural.

Not quite. A more standard written form is:

فایل‌های پروژه

Here is why:

• ها is attached to the noun with a half-space
• when ezafe is added after ها, it becomes هایِ, usually written as های

So the most standard version of the whole sentence would be:

من فایل‌های پروژه را دیروز آماده کردم و امروز آن‌ها را چاپ می‌کنم.

What you saw in the original sentence is very common in everyday typing, but it is a little less formal/standard.

The standard form is:

می‌کنم

with می‌ attached to the verb by a half-space.

Many people casually type:

• میکنم

but the more standard spelling is:

• می‌کنم

Also note that because چاپ کردن is a compound verb, the standard written form is:

چاپ می‌کنم

not چاپمی‌کنم.

So the most standard version is:

• چاپ می‌کنم

In careful written Persian, it is را. But in everyday spoken Persian, it is very often pronounced more like:

رو

So:

• فایل‌های پروژه را often sounds like فایل‌های پروژه رو
• آن‌ها را often sounds like آن‌ها رو

This is one reason learners may hear a difference between written and spoken Persian.

Yes, آن‌ها / آنها is more neutral or written-style. In everyday conversation, many speakers would say:

اونا

And spoken Persian also often pronounces را as رو.

So a more conversational version would be:

من فایل‌های پروژه رو دیروز آماده کردم و امروز اونا رو چاپ می‌کنم.

This means the same thing, but sounds more natural in casual speech.

Yes. چاپ کردن is a normal and correct verb meaning to print. But in everyday speech, many people also use borrowed or alternative expressions depending on context, such as:

• پرینت گرفتن = to take a printout / to print
• پرینت کردن = to print

So depending on the speaker, you might hear:

• امروز آن‌ها را چاپ می‌کنم
• امروز از آن‌ها پرینت می‌گیرم
• امروز آن‌ها را پرینت می‌کنم

All can be understood, though چاپ کردن is a solid standard choice.