Ben adresi karıştırdım, bu yüzden geç kaldım.

Yes, ben is optional here.

Turkish usually does not need subject pronouns, because the verb ending already tells you who the subject is:

• karıştırdım = I mixed up / I confused
• kaldım = I stayed / I was (in this expression, I was late)

So the more natural everyday version is often:

• Adresi karıştırdım, bu yüzden geç kaldım.

Using ben adds emphasis, like:

• I mixed up the address, so I was late.

English needs I, but Turkish often leaves it out unless it is being emphasized or contrasted.

Because adresi is the definite direct object form.

The verb karıştırmak here takes an object: you mixed up the address. In Turkish, when a direct object is specific/definite, it usually takes the accusative ending.

• adres = address
• adresi = the address

So:

• Adresi karıştırdım = I mixed up the address
• Adres karıştırdım would sound wrong in normal Turkish

This -i is the accusative ending, and after some nouns it may appear in different vowel-harmony forms:

• kitabı
• evi
• okulu
• gülü

Here it becomes adresi.

That -s- is a buffer consonant.

When a Turkish suffix beginning with a vowel is added to a noun that already ends in a vowel, Turkish often inserts a buffer consonant. But here there is a slightly different issue: adres already ends in a consonant, yet the dictionary form of some borrowed nouns and their suffixed forms can look a bit irregular if you are expecting a simple -i attachment.

What matters for learners is this:

• adres
  • accusative = adresi

You should learn this as the normal suffixed form. It is not unusual in Turkish for some nouns, especially loanwords, to have forms that are best memorized directly.

Here, karıştırmak means to mix up, to confuse, or to get something wrong by confusing it with something else.

So:

• Adresi karıştırdım = I mixed up the address

Depending on context, karıştırmak can also mean:

• to mix something physically
  
  • Çayı karıştırdım. = I stirred/mixed the tea.
• to confuse one thing with another
  
  • Onu kardeşiyle karıştırdım. = I confused him with his brother.

In this sentence, it means you got the address wrong because you confused it.

It breaks down like this:

• karıştır- = verb stem, mix up / confuse
• -dı = past tense
• -m = I

So:

• karıştırdım = I mixed up / I confused

This is a very common pattern in Turkish:

• geldim = I came
• gördüm = I saw
• anladım = I understood
• karıştırdım = I mixed up

The tense ending changes according to vowel harmony and consonant voicing, so you may also see -di, -du, -dü, -tı, -ti, -tu, -tü in other verbs.

Because of vowel harmony.

The main vowel in the last syllable before the suffix is ı in karıştır-, so the past ending follows that pattern:

• -dı

Then the first-person ending is:

• -m

So:

• karıştırdım

Compare:

• geldim from gel-
• buldum from bul-
• gördüm from gör-
• karıştırdım from karıştır-

Turkish suffix vowels often change to match the vowels in the word before them.

Bu yüzden means because of this, for this reason, or more naturally in English, so or therefore.

In this sentence:

• Ben adresi karıştırdım, bu yüzden geç kaldım.
• I mixed up the address, so I was late.

It connects the cause and the result:

• cause: I mixed up the address
• result: I was late

Other common alternatives are:

• bu nedenle = for this reason
• ondan dolayı = because of that
• onun için = therefore / so / because of that

Bu yüzden is very natural and common.

Literally, it is something like I remained late or I ended up late, but the natural meaning is simply:

• I was late

This is a fixed Turkish expression:

• geç kalmak = to be late

So:

• geç kaldım = I was late
• geç kaldı = he/she was late
• geç kaldık = we were late

You should learn geç kalmak as a set phrase rather than trying to translate each word separately every time.

Because Turkish often expresses ideas differently from English.

In English, we say:

• to be late

In Turkish, the natural expression is:

• geç kalmak

Word by word, that is closer to to remain late / to stay late, but as an idiom it simply means to be late.

Many languages do this. The important thing is to learn the Turkish expression as the standard way to say it.

No. In natural English, you would say:

• I was late

Not:

• I got late

Even though Turkish uses kalmak, which may feel more dynamic than English be, the correct English translation is still I was late.

Yes, Turkish word order is flexible, but this order is very natural.

The sentence is:

• Ben adresi karıştırdım, bu yüzden geç kaldım.

A very normal structure is:

• subject + object + verb, then
• connector + phrase + verb

Turkish often places the verb at the end of each clause, which is exactly what happens here:

• adresi karıştırdım
• geç kaldım

You could omit ben:

• Adresi karıştırdım, bu yüzden geç kaldım.

That is probably the most neutral version.

Turkish does not have articles like a/an and the.

Instead, Turkish often shows definiteness through context and grammar. In this sentence, the accusative-marked object adresi strongly suggests a specific address:

• adresi = the address

So even without a separate word for the, the meaning is clear.

It is natural and helpful, especially in writing, because bu yüzden connects two clauses:

• Adresi karıştırdım, bu yüzden geç kaldım.

The comma makes the sentence easier to read. In informal writing, people are sometimes less strict, but using the comma here is a good habit.

Not exactly.

• karıştırmak suggests mixing it up, confusing it, or getting it wrong
• unutmak means to forget

So:

• Adresi karıştırdım = I mixed up the address / I confused the address
• Adresi unuttum = I forgot the address

These are different situations.

Yes, it can imply that.

If you mixed up the address, the listener may naturally understand that you used the wrong address, went to the wrong location, or got delayed because of that confusion.

However, the sentence itself specifically says:

• you confused the address
• because of that, you were late

It does not explicitly say I went to the wrong address, although that may be the real-world result.

Yes, it is natural and correct.

A very normal everyday version would be:

• Adresi karıştırdım, bu yüzden geç kaldım.

Including ben is also correct, but slightly more emphatic:

• Ben adresi karıştırdım, bu yüzden geç kaldım.

So both are fine, and the version without ben is often the more typical conversational choice.