Η δοκιμαστική οδήγηση αρχίζει τώρα.

A reasonable learner-friendly pronunciation is:

ee tho-kee-ma-stee-KEE o-THEE-yee-see ar-KHEE-zee TO-ra

A few notes:

• Η is pronounced ee
• δ sounds like the th in this
• γ before η / ι often sounds like a soft y sound
• χ is a rough sound that English does not really have; in this word it is fairly soft, somewhat like a breathy h or the German ch
• The stressed syllables are marked by the accents:
  • δοκιμαστική
  • οδήγηση
  • αρχίζει
  • τώρα

So the rhythm is roughly:

do-ki-ma-sti-KEE o-THEE-yi-si ar-KHEE-zi TO-ra

Here is the structure:

• Η = the
• δοκιμαστική = test / trial
• οδήγηση = driving / drive
• αρχίζει = starts / begins
• τώρα = now

So grammatically:

• Η δοκιμαστική οδήγηση = the subject, the test drive
• αρχίζει = the verb, starts
• τώρα = an adverb of time, now

Η is the feminine singular definite article, meaning the.

It is there because οδήγηση is a feminine singular noun, so the article must match it:

• η οδήγηση = the drive / the driving

Since δοκιμαστική describes οδήγηση, the whole phrase is feminine singular:

• η δοκιμαστική οδήγηση = the test drive

Also, be careful not to confuse:

• η = the
• ή = or

They look almost the same, but ή has an accent.

Because it is an adjective modifying οδήγηση, and Greek adjectives agree with the noun they describe.

Here, οδήγηση is:

• feminine
• singular
• nominative

So the adjective must also be:

• feminine
• singular
• nominative

That is why you get:

• δοκιμαστικός = masculine
• δοκιμαστική = feminine
• δοκιμαστικό = neuter

In this sentence, the correct form is δοκιμαστική because οδήγηση is feminine.

οδήγηση is a noun meaning driving or drive, depending on context.

It comes from the verb οδηγώ, meaning to drive or to lead/guide.

So:

• οδηγώ = I drive
• οδήγηση = driving / a drive

In δοκιμαστική οδήγηση, it refers to a test drive, not driving in general as a skill.

Because the subject is η δοκιμαστική οδήγηση = the test drive, which is third person singular.

Greek verbs change form depending on the subject:

• αρχίζω = I start / I begin
• αρχίζεις = you start
• αρχίζει = he/she/it starts

Since the test drive is equivalent to it, Greek uses:

• αρχίζει = starts / begins

So the sentence literally works like:

• The test drive starts now

No. Greek does not need a separate subject pronoun in a sentence like this, especially when the subject noun is already stated.

English might think in terms of it starts now, but Greek already has the subject:

• Η δοκιμαστική οδήγηση = the test drive

So nothing extra is needed. The verb ending also helps show the person and number.

Yes, Greek word order is more flexible than English word order.

The neutral order here is:

• Η δοκιμαστική οδήγηση αρχίζει τώρα

But you could also hear:

• Τώρα αρχίζει η δοκιμαστική οδήγηση
• Αρχίζει τώρα η δοκιμαστική οδήγηση

These alternatives may shift the emphasis slightly:

• putting τώρα first emphasizes now
• putting the verb first can sound a bit more dramatic or announcement-like

Still, the original sentence is very natural and straightforward.

Yes, δοκιμαστική οδήγηση is a normal and standard way to say test drive.

It is built very logically:

• δοκιμαστική = test / trial
• οδήγηση = drive / driving

So it literally means something like trial drive or test driving, but in actual use it corresponds to test drive.

This is exactly the kind of phrase you might hear at a car dealership or in an advertisement.

The accent marks show which syllable is stressed.

In Modern Greek, stress matters for pronunciation, and written accents help you place it correctly:

• δοκιμαστική
• οδήγηση
• αρχίζει
• τώρα

If you ignore the accents, your pronunciation may sound unnatural or sometimes be harder to understand.

A useful habit is to learn each new Greek word together with its stress. For example:

• not just οδηγηση
• but οδήγηση

Either is fine. Αρχίζει can mean both starts and begins.

In this sentence:

• The test drive starts now
• The test drive begins now

Both are natural English translations.

Usually starts sounds a little more everyday and conversational, while begins can sound slightly more formal, but both fit the Greek perfectly well.