Metni kopyalamadan önce yazım hatalarını düzeltelim.

Metni is the word metin (text) with the definite/direct object ending.

• Base form: metin = text
• As a definite object: metni = the text

In Turkish, when a noun is a specific direct object, it usually takes an accusative-type ending. Here, the sentence is talking about a specific text, so metni is used.

Also note the small spelling change:

• metin + i would not stay as metini
• it becomes metni

This is a common pattern with some Turkish nouns.

kopyalamadan önce means before copying or before we copy it.

It is built like this:

• kopyala- = to copy
• -ma/-me = negative marker
• -dan/-den = from
• önce = before

So literally, kopyalamadan önce is something like before not-copying from, but as a fixed grammatical structure it simply means before copying.

In Turkish, verb + -madan/-meden + önce is a very common way to say before doing something.

Examples:

• Gitmeden önce = before going
• Yemek yemeden önce = before eating

This is just how the structure works in Turkish. The ending -madan/-meden is used in time expressions meaning before doing something.

So even though it contains the negative marker -ma/-me, the whole expression does not mean a negative action in normal English translation.

For example:

• çıkmadan önce = before leaving
• başlamadan önce = before starting

It is best to learn -madan önce as a single pattern meaning before doing.

Önce means before, but in Turkish it often comes after the word or phrase it relates to.

So:

• kopyalamadan önce = before copying

This may feel reversed to an English speaker, because English usually puts before first:

• before copying

But Turkish commonly puts the time expression first and the marker önce after it.

This phrase means the spelling mistakes/errors as the object of the verb.

It breaks down like this:

• yazım = spelling / orthography
• hata = mistake, error
• hataları = the mistakes / his-her-its mistakes / their mistakes, depending on context

Here, yazım hataları is a noun phrase meaning spelling mistakes.

Then because this whole phrase is the definite direct object of düzeltelim, it becomes yazım hatalarını.

So:

• yazım hataları = spelling mistakes
• yazım hatalarını = the spelling mistakes

The -ı/-i/-u/-ü part marks the noun phrase as a definite object.

The n appears as a buffer consonant because the noun already has another ending before it.

You can think of it like this:

• hata = error
• hatalar = errors
• hataları = the errors / their errors / his-her-its errors
• hatalarını = those errors as a definite object

In this sentence, it is best understood as the spelling mistakes being corrected.

Düzeltelim comes from düzeltmek, which means to correct or to fix.

The ending -elim/-alım means let’s ...

So:

• düzeltelim = let’s correct
• or more naturally, let’s fix

This is the first person plural suggestion/imparative form.

Other examples:

• Gidelim = let’s go
• Başlayalım = let’s begin

Turkish normally places the main verb at the end of the sentence.

So the structure is very typical:

• Metni = the text
• kopyalamadan önce = before copying
• yazım hatalarını = the spelling mistakes
• düzeltelim = let’s correct

This final-verb order is one of the most important patterns in Turkish syntax.

Not exactly.

• yazmak = to write
• yazma can mean writing in a more general verbal-noun sense
• yazım usually refers to spelling or orthography

So yazım hatası specifically means a spelling mistake, not just any writing mistake.

Yes, that is a very natural understanding.

Turkish often leaves some relationships implicit when they are obvious from context. Even though the sentence literally says something like:

• Before copying the text, let’s correct the spelling mistakes

the intended meaning is naturally:

• Before copying the text, let’s correct the spelling mistakes in it

The connection between the text and the spelling mistakes is understood.

Because Turkish verbs already show the subject.

In düzeltelim, the ending tells you it means let’s correct, which includes we.

Turkish often leaves subject pronouns out unless they are needed for emphasis or contrast.

So:

• düzeltelim already means let us correct
• no separate biz is necessary

Yes. A very useful pattern here is:

[object] + [verb + -madan önce] + [object] + [verb in let’s form]

In this sentence:

• Metni = object
• kopyalamadan önce = before copying
• yazım hatalarını = object
• düzeltelim = let’s correct

Two especially useful chunks to remember are:

• -madan/-meden önce = before doing
• -elim/-alım = let’s do

If you learn those two patterns, this sentence becomes much easier to understand.