He treballat tot el dia.

No. In He treballat, he is not a pronoun. It is the 1st person singular present tense of the auxiliary verb haver: he = I have.

So the structure is:

• he = I have
• treballat = worked

Together: He treballat = I have worked.

Catalan uses haver + past participle to form this tense, much like English uses have + past participle.

In Catalan, subject pronouns are often omitted because the verb form already shows who the subject is.

• he already tells you the subject is I
• so Jo he treballat is possible, but usually unnecessary

You would add jo mainly for emphasis or contrast, for example:

• Jo he treballat, però ell no. = I worked / I have worked, but he didn’t.

So He treballat tot el dia is the normal, natural version.

It is the present perfect (also called the perfet compost in Catalan grammar).

It is formed with:

• haver in the present tense
• • a past participle

Here:

• he = present of haver
• treballat = past participle of treballar

So:

• he treballat = I have worked

Depending on context, English might translate it as either:

• I have worked all day
• or sometimes I’ve been working all day

Treballat is the past participle of treballar.

For regular Catalan verbs:

• -ar verbs usually form the participle in -at
• -er / -re verbs often form it in -ut
• -ir verbs often form it in -it

So:

• treballar → treballat
• perdre → perdut
• dormir → dormit

That is why He treballat follows a very regular pattern.

Normally, no. When the participle is used with haver, it usually does not agree with gender or number.

So you say:

• He treballat whether the speaker is male or female
• Hem treballat for we have worked

The participle stays treballat.

This is different from some uses with ser or as an adjective, where agreement can happen.

Tot el dia means all day or the whole day.

Here’s the breakdown:

• tot = all / whole
• el dia = the day

It is tot because dia is a masculine singular noun.

Compare:

• tot el dia = all day
• tota la nit = all night

So tota el dia is wrong because tota is feminine, while dia is masculine.

Yes, but the nuance and regional preference can vary.

• He treballat tot el dia = present perfect
• Vaig treballar tot el dia = simple past / periphrastic past

In many varieties of Catalan, especially Central Catalan, He treballat often suggests a past action connected to the present, similar to English I have worked.

Vaig treballar is also common and may sound more like a finished past event: I worked.

In real usage, the choice depends on dialect, style, and context. Both can be correct.

Yes. That is also very natural.

• He treballat tot el dia = I have worked all day
• He estat treballant tot el dia = I have been working all day

The second version emphasizes the ongoing activity more strongly.

So:

• He treballat tot el dia is a straightforward statement of what you did
• He estat treballant tot el dia highlights the duration/process

Both are good, but they are not exactly identical in tone.

A careful Central Catalan pronunciation is approximately:

eh truh-buh-LYAT tot ul DEE-uh

A few useful points:

• treballat has the ll sound written ll, similar to a ly sound for many learners
• the stress is on -llat: tre-ba-LLAT
• dia has two vowel sounds: DI-a

If you want a rough stress guide:

• He treballat tot el dia
• he tre-ba-LLAT tot el DI-a

It is completely natural on its own. It works well as a simple statement, for example when explaining why you are tired or busy.

Examples:

• Estic cansat. He treballat tot el dia. = I’m tired. I’ve worked all day.
• No he pogut sortir; he treballat tot el dia. = I haven’t been able to go out; I’ve worked all day.

So even without extra context, it sounds like a normal everyday sentence.

Yes, but He treballat tot el dia is the most neutral and common order.

You might also hear:

• Tot el dia he treballat — this puts more emphasis on all day
• He treballat, tot el dia — possible in speech, but less neutral and more marked

For learners, the safest default is:

• He treballat tot el dia

That is the most standard word order.