Bu akşam iyice yorgunum, bu yüzden evde kalıyorum.

In Turkish, present-tense to be is often expressed with a personal ending instead of a separate verb.

• yorgun = tired
• -um = I am / first-person singular ending

So:

• yorgunum = I am tired

This is very common with adjectives and nouns:

• mutluyum = I am happy
• öğrenciyim = I am a student

So Turkish does not need a separate word for am here.

Because of vowel harmony.

The personal ending here changes to match the last vowel of the word:

• last vowel in yorgun is u
• after u, the matching form is -um

So:

• yorgun + um → yorgunum

Compare:

• iyiyim = I am well
• üzgünüm = I am sad
• hazırım = I am ready

The ending changes shape depending on the vowels in the word before it.

Bu akşam means this evening or tonight, depending on context.

Breakdown:

• bu = this
• akşam = evening

Together, it refers to the evening of the current day.

English may translate it as:

• this evening
• tonight

Both are natural depending on the situation.

İyice is an intensifier here. It means something like:

• really
• quite
• thoroughly
• very much

So iyice yorgunum means more than just I’m tired. It suggests:

• I’m really tired
• I’m quite worn out
• I’m thoroughly tired

In everyday speech, it often strengthens the adjective naturally.

Bu yüzden means:

• therefore
• so
• for this reason
• because of this

Breakdown:

• bu = this
• yüzden = because of / due to / for that reason

Together, it works like a linking phrase between the two ideas:

• I’m really tired, so I’m staying home.

The bu here does not repeat this evening. It refers to the whole previous idea: because I’m really tired.

Because evde means at home or in the house, while ev just means house/home as a basic noun.

Breakdown:

• ev = house, home
• -de = in, at

So:

• evde = at home / in the house

This -de is the locative case ending.

Examples:

• okulda = at school
• işte = at work
• masada = on the table / at the table

Kalıyorum comes from the verb kalmak, which means to stay or to remain.

Breakdown:

• kal- = verb stem
• -ıyor = present continuous tense
• -um = I

So:

• kalıyorum = I am staying / I stay

This tense is extremely common in Turkish and often covers what English expresses with both:

• I am staying
• I’m staying
• sometimes even I stay

depending on context.

Yes, literally it is I am staying at home, but in Turkish the present continuous is also often used for a current decision or near-future action.

So evde kalıyorum can mean:

• I’m staying home
• I’m staying at home
• I’m going to stay home in this situation

It sounds natural because the speaker is describing what they are doing this evening as a present plan/result of being tired.

Because Turkish often drops subject pronouns when they are already clear from the verb ending.

Here, yorgunum and kalıyorum both clearly show first person singular:

• -um in yorgunum = I am
• -um in kalıyorum = I

So ben is unnecessary.

If you added it, Ben bu akşam iyice yorgunum, bu yüzden evde kalıyorum, it would still be correct, but it might sound more emphatic, like:

• I’m really tired tonight, so I’m staying home.

They mean slightly different things.

• evdeyim = I am at home
• evde kalıyorum = I am staying home / I am remaining at home

So in this sentence, kalıyorum emphasizes the decision or action of staying home because of tiredness.

Compare:

• Bu akşam evdeyim. = I’m at home tonight.
• Bu akşam evde kalıyorum. = I’m staying home tonight.

The second one matches the idea of because I’m tired, I’m not going out.

The given word order is very natural:

• Bu akşam iyice yorgunum, bu yüzden evde kalıyorum.

Turkish word order is flexible, but not completely free. Speakers can move parts around for emphasis.

For example:

• Bu yüzden bu akşam evde kalıyorum. = Therefore, I’m staying home tonight.
• Evde kalıyorum, çünkü bu akşam iyice yorgunum. = I’m staying home because I’m really tired tonight.

The original sentence sounds smooth and neutral: first the reason, then the result.

It is natural and helpful here because the sentence has two connected clauses:

1. Bu akşam iyice yorgunum
2. bu yüzden evde kalıyorum

The comma marks a pause before bu yüzden and makes the relationship between the two parts clearer.

In casual writing, people may sometimes omit punctuation, but with standard writing, the comma is a good choice here.