Αυτή η περίοδος τελειώνει σύντομα.

Yes. Αυτή η is how Greek commonly says this before a feminine singular noun.

In this sentence:

• αυτή = this
• η = the (feminine singular article)
• περίοδος = period

So αυτή η περίοδος literally looks like this the period, but in natural Greek that is the normal way to say this period.

Greek demonstratives often work together with the article:

• αυτό το βιβλίο = this book
• αυτή η μέρα = this day
• αυτό το σπίτι = this house

That is just a normal Greek structure. After αυτός / αυτή / αυτό when used as this, Greek usually includes the definite article before the noun.

So:

• αυτή η περίοδος = this period
• not just αυτή περίοδος

This is one of the common differences between English and Greek grammar: Greek often uses the article where English does not.

Great question. Many Greek nouns ending in -ος are masculine, but not all of them. Περίοδος is one of the nouns ending in -ος that is feminine.

That is why it takes feminine words around it:

• αυτή not αυτός
• η not ο

So the gender is something you have to learn with the noun:

• η περίοδος = feminine

This is a good reminder that noun endings help, but they do not guarantee gender.

Περίοδος can mean several things depending on context. Common meanings include:

• a period of time
• a phase
• a sentence/period in grammar or writing
• in some contexts, menstrual period

In Αυτή η περίοδος τελειώνει σύντομα, the most likely meaning is this period / this phase / this time period. The exact English choice depends on the context already given.

Τελειώνει is the third person singular present tense of the verb τελειώνω, which means to end, to finish, or sometimes to be ending.

So:

• τελειώνω = I end / I finish
• τελειώνεις = you end / you finish
• τελειώνει = he/she/it ends, is ending

Here it matches η περίοδος, which is singular, so Greek uses the singular verb form:

• Αυτή η περίοδος τελειώνει = This period ends / is ending

Greek can use the present tense for something current, ongoing, or near/imminent, especially when the context makes the timing clear.

So τελειώνει σύντομα can mean:

• ends soon
• is ending soon

If you want to make the future more explicit, Greek can also say:

• Αυτή η περίοδος θα τελειώσει σύντομα.

That means more clearly This period will end soon.

So the version with τελειώνει is natural, especially when the idea is that the end is approaching.

Σύντομα means soon. It is an adverb, so it modifies the verb:

• τελειώνει σύντομα = ends soon

It tells you when the action happens.

A few similar time adverbs are:

• τώρα = now
• αργότερα = later
• σύντομα = soon

Yes, stress matters in Greek and can sometimes distinguish words.

In this sentence, the stressed syllables are:

• Αυτή → stress on the second syllable
• περίοδος → stress on ρί
• τελειώνει → stress on ώ
• σύντομα → stress on σύ

A rough pronunciation guide:

• Αυτή ≈ af-TEE
• η ≈ ee
• περίοδος ≈ pe-REE-o-thos
• τελειώνει ≈ te-lee-O-nee
• σύντομα ≈ SEEN-to-ma

You do not need to pronounce them exactly like English syllables, but noticing the stressed syllable is very important.

Because Greek usually does not need subject pronouns when the verb ending already shows the person and number.

In English, you must say:

• It ends soon

In Greek, the verb form itself already tells you the subject is he/she/it singular:

• τελειώνει = he/she/it ends

And since Αυτή η περίοδος is already stated, there is no need to add another pronoun.

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

The basic sentence is:

• Αυτή η περίοδος τελειώνει σύντομα.

But you may also hear variations such as:

• Η περίοδος αυτή τελειώνει σύντομα.
• Σύντομα τελειώνει αυτή η περίοδος.

These alternatives can sound more formal, more marked, or give different emphasis. The original version is very natural and straightforward.

It is the most standard and common way, but not the only possible wording.

You can also find:

• η περίοδος αυτή

This also means this period, but it is often a bit more formal or stylistically marked.

So:

• αυτή η περίοδος = the usual everyday order
• η περίοδος αυτή = also correct, sometimes more formal or emphatic

They agree in gender, number, and case.

Here they are all:

• feminine
• singular
• nominative (because this is the subject of the sentence)

So the matching set is:

• αυτή = feminine singular nominative demonstrative
• η = feminine singular nominative article
• περίοδος = feminine singular nominative noun

This kind of agreement is a very important feature of Greek grammar.

Yes. In many contexts, either can work.

Greek present tense often covers both ideas that English separates into:

• simple present: ends
• present progressive: is ending

So Αυτή η περίοδος τελειώνει σύντομα could be understood as:

• This period ends soon
• This period is ending soon

The best English choice depends on the tone and context.