Ben biraz üşüttüm galiba; durmadan hapşırdığım için bugün dışarı çıkmayacağım.

Yes — Turkish verb endings already show the subject here:

• üşüttüm = I caught a chill / got cold
• çıkmayacağım = I will not go out

So ben is not required grammatically. It is often added for:

• emphasis
• contrast
• a slightly more natural spoken rhythm in some contexts

So this sentence would still work without it:

• Biraz üşüttüm galiba; durmadan hapşırdığım için bugün dışarı çıkmayacağım.

Including ben just gives a mild sense of “as for me” or “I think I…”.

In everyday Turkish, üşütmek often means:

• to catch a chill
• to get chilled
• sometimes more loosely to be coming down with something

So biraz üşüttüm galiba is a very natural way to say something like:

• I think I’ve caught a bit of a chill
• I think I might be getting sick
• I think I got a little chilled

It does not necessarily mean only I felt cold at that moment. It often suggests that being cold has led to feeling unwell.

This is a very common question.

• üşümek = to feel cold
• üşütmek = to get chilled / catch a chill / become unwell from cold

Examples:

• Üşüyorum. = I’m cold.
• Dün gece çok üşüdüm. = I felt very cold last night.
• Sanırım üşüttüm. = I think I caught a chill / I think I’m getting sick.

So in your sentence, üşüttüm is not just about temperature; it suggests a possible cause of illness.

Biraz means a little / somewhat.

In this sentence, it softens the statement:

• biraz üşüttüm = I caught a slight chill
• or I’m a little under the weather

Without biraz, the sentence can sound a bit stronger or more direct:

• Üşüttüm galiba. = I think I caught a chill.

With biraz, it sounds milder and more natural in many everyday situations.

Galiba means:

• I think
• probably
• apparently
• it seems

It shows uncertainty or a guess.

So:

• Biraz üşüttüm galiba. = I think I caught a bit of a chill.

Its position is fairly flexible in Turkish. You could also hear:

• Galiba biraz üşüttüm.

Both are natural. The version in your sentence places galiba after the clause, which is very common in speech and gives a slightly reflective tone, like “I seem to have…” or “I guess…”.

Durmadan means:

• without stopping
• constantly
• nonstop

It comes from durmak (to stop) plus the -madan / -meden form, which means without doing something.

So:

• durmak = to stop
• durmadan = without stopping / nonstop

In the sentence:

• durmadan hapşırdığım için = because I’ve been sneezing nonstop

This is a very common adverb in Turkish.

Hapşırdığım comes from the verb hapşırmak (to sneeze).

Here is the structure:

• hapşır- = sneeze
• -dık / -dik / -duk / -dük = a verbal noun / participle ending
• -ım / -im / -um / -üm = my

So hapşırdığım literally means something like:

• my sneezing
• the fact that I sneeze / sneezed / have been sneezing

In this sentence, it is part of the structure:

• hapşırdığım için = because I am sneezing / because I’ve been sneezing

This kind of form is very common in Turkish when one clause is turned into a noun-like phrase.

Because Turkish usually does not use a fully conjugated finite verb directly before için to mean because.

Instead, Turkish often turns the action into a noun-like clause:

• hapşırdığım için = because I sneeze / because I’ve been sneezing
• literally: because of my sneezing

This pattern is extremely common:

• geldiğim için = because I came
• yorgun olduğum için = because I am tired
• vaktim olmadığı için = because I don’t have time

So this is one of the key Turkish patterns for giving reasons.

All of these can express a reason, but they differ a bit in style.

• hapşırdığım için = very common, neutral, everyday
• hapşırdığımdan dolayı = also means because of my sneezing, but sounds a bit heavier or more formal
• hapşırdığımdan can sometimes work in contexts where -den dolayı is understood, but için is simpler and more common here

So hapşırdığım için is the most natural everyday choice in this sentence.

This form does not map neatly onto one English tense.

In context, hapşırdığım için can mean:

• because I’m sneezing
• because I’ve been sneezing
• sometimes because I sneezed

Here, because of durmadan (nonstop) and the decision I won’t go out today, the most natural sense is:

• because I’ve been sneezing nonstop
• or because I’m sneezing nonstop

So the exact time is understood from context rather than from a single English-style tense.

İçin often means:

• for
• because of
• due to

After a noun or noun-like clause, it can give a reason.

In this sentence:

• hapşırdığım için = because I’ve been sneezing

Compare:

• senin için = for you
• bu iş için = for this job / for this matter
• hasta olduğum için = because I am sick

So için is doing the job of because / because of here.

Çıkmayacağım comes from:

• çıkmak = to go out / leave
• -ma- = negation
• -yacak / -yecek = future
• -ım / -im / -um / -üm = first person singular (I)

So:

• çık-ma-yacağ-ım = I will not go out

Because of vowel harmony and consonant changes, it appears as:

• çıkmayacağım

This is the standard future negative form.

Both are possible in Turkish, but they give slightly different feels.

• çıkmıyorum = I’m not going out / I’m not going out today
• çıkmayacağım = I won’t go out

In your sentence, çıkmayacağım sounds like a decision based on the reason given:

• Because I’ve been sneezing nonstop, I won’t go out today.

It emphasizes intention or future choice a bit more than çıkmıyorum would.

Dışarı çıkmak is a very common expression meaning:

• to go outside
• to go out

Breaking it down:

• dışarı = outside
• çıkmak = to exit / go out

Together:

• dışarı çıkmak = to go out / go outside

So:

• bugün dışarı çıkmayacağım = I won’t go out today

Turkish word order is flexible, but the usual unmarked order is that time expressions often come before the main verb.

So:

• bugün dışarı çıkmayacağım = today I won’t go out

You could also hear:

• dışarı bugün çıkmayacağım
• bugün çıkmayacağım
• bugün dışarıya çıkmayacağım

But the version in your sentence is the most natural neutral order.

Yes. Both can be used.

• dışarı çıkmak
• dışarıya çıkmak

Both mean to go outside.

Often:

• dışarı is more common in everyday speech
• dışarıya can sound slightly more explicit, but it is not a major difference here

So bugün dışarı çıkmayacağım is completely natural.

The semicolon links two closely related parts:

1. Ben biraz üşüttüm galiba
2. durmadan hapşırdığım için bugün dışarı çıkmayacağım

It shows that the second clause explains or follows from the first.

In normal writing, you could also use:

• a comma
• a period
• sometimes even just a pause in speech

So the semicolon is a punctuation choice, not a special grammar rule.

It is neutral everyday Turkish.

Nothing in it is especially formal or especially slangy. It sounds like a natural thing someone might say in conversation:

• I think I’ve caught a bit of a chill; since I’ve been sneezing nonstop, I won’t go out today.

Words like:

• galiba
• biraz
• durmadan
• dışarı çıkmayacağım

all fit normal spoken and written Turkish well.

A native speaker would usually hear it as:

• a mild self-diagnosis
• not very dramatic
• slightly uncertain

It sounds like the speaker is noticing symptoms and concluding:

• I think I may be coming down with something
• I think I caught a bit of a chill

So biraz makes it softer, and galiba makes it less certain. Together they create a natural, cautious tone.