Συμπληρώνω τη φόρμα στο σπίτι και μετά τη στέλνω στη γραμματεία.

Because the two τη forms do different jobs:

• τη φόρμα: here τη is the definite article = the
• τη στέλνω: here τη is a weak object pronoun = it / her

So:

• τη φόρμα = the form
• τη στέλνω = I send it

They look the same because both are feminine singular accusative forms in Modern Greek.

Greek often leaves out subject pronouns when they are not needed. The verb ending already shows the subject.

• συμπληρώνω = I fill in / I complete
• στέλνω = I send

So Greek does not need εγώ unless you want emphasis or contrast:

• Εγώ συμπληρώνω τη φόρμα... = I fill in the form... (emphatic)

This is very normal in Greek.

Both are in the present tense.

• συμπληρώνω = I fill in / I am filling in
• στέλνω = I send / I am sending

In Greek, the present tense here is also imperfective, so it can describe:

• a regular/habitual action: I fill in the form at home and then send it...
• a present-time action, depending on context

Without extra context, this sentence can sound like a general routine or a simple present statement.

Because φόρμα is the direct object of συμπληρώνω.

You complete something, so that thing goes in the accusative case. For feminine singular nouns like φόρμα, the article in the accusative is τη(ν):

• nominative: η φόρμα = the form
• accusative: τη φόρμα = the form

So Συμπληρώνω τη φόρμα literally means I complete the form.

These are contractions of σε + article:

• σε + το → στο
• σε + τη(ν) → στη(ν)

So:

• στο σπίτι = in/at home
• στη γραμματεία = to/at the office/secretariat

This is completely standard in Modern Greek.

In Modern Greek, the preposition σε normally takes the accusative.

So:

• στη γραμματεία = to the office / to the administration office
• article: τη
• noun form: γραμματεία

Even when English uses different prepositions like to, in, or at, Greek often uses σε + accusative.

Because in Modern Greek, weak object pronouns usually come before a finite verb.

So:

• τη στέλνω = I send it
• not usually στέλνω τη in normal standard usage

This is a very basic Greek word-order pattern:

• τον βλέπω = I see him
• τη θέλω = I want it/her
• το γράφω = I write it

Because once τη φόρμα has already been mentioned, Greek naturally replaces it with a pronoun.

So instead of saying:

• ...και μετά στέλνω τη φόρμα στη γραμματεία

it says:

• ...και μετά τη στέλνω στη γραμματεία

This avoids repetition, just like English the form ... then I send it.

Here μετά means afterwards, then, or after that.

So the sentence shows sequence:

1. Συμπληρώνω τη φόρμα στο σπίτι
2. και μετά τη στέλνω στη γραμματεία

In other words: first one action, then the next action.

Both are related to the same article/pronoun form: την.

In Modern Greek, the final -ν is often dropped before many consonants, especially in everyday usage:

• την φόρμα → commonly τη φόρμα

The full form την is kept more often before:

• vowels
• words beginning with κ, π, τ, ξ, ψ
• and some consonant clusters, depending on pronunciation and style

So τη φόρμα is normal and correct.

Because the noun is definite: it means the home / home in a specific understood sense.

Greek usually uses the article where English may not:

• στο σπίτι literally = in the house/home
• but naturally translated as at home

So Greek often sounds more article-heavy than English.

Yes, Greek word order is fairly flexible, but different orders can change emphasis or style.

The given sentence is neutral and natural:

• Συμπληρώνω τη φόρμα στο σπίτι και μετά τη στέλνω στη γραμματεία.

But you could also hear things like:

• Τη φόρμα τη συμπληρώνω στο σπίτι και μετά τη στέλνω στη γραμματεία.

That version puts more focus on the form. Greek often moves things around for emphasis, while still keeping the meaning clear through articles, pronouns, and verb endings.

Literally, σπίτι means house/home, so στο σπίτι is literally in the house/home. But very often it is used just like English at home.

So in this sentence:

• στο σπίτι is best understood naturally as at home

This is one of those places where the most natural English translation is not the most literal one.