Αύριο θα μιλήσω με την προϊσταμένη μου, γιατί η νέα σύμβαση και η ασφάλιση δεν είναι ακόμα έτοιμες.

Because αύριο here is an adverb, meaning tomorrow. As an adverb, it does not take an article.

• Αύριο θα μιλήσω... = Tomorrow I will speak...

Greek also has το αύριο, but that is different: it is a noun meaning something like the future / tomorrow as a concept in certain contexts.

Θα is the particle used to form the future, and it is followed by a verb form that historically comes from the subjunctive. So:

• θα μιλήσω = I will speak

The form μιλήσω is the aorist-based form, which is very common after θα when referring to a single, complete action.

Compare:

• θα μιλήσω = I will speak / I’ll have a talk
• θα μιλάω / θα μιλώ = I will be speaking / I will speak regularly

In this sentence, the speaker means one future conversation, so θα μιλήσω is the natural choice.

In traditional learner terms, μιλήσω is the aorist subjunctive form, but after θα it functions as part of the future construction.

So in practice, you can think of:

• μιλάω = I speak / I am speaking
• να μιλήσω = to speak, that I speak, that I should speak
• θα μιλήσω = I will speak

The important practical point is: after θα, Greek usually uses this kind of form for a future single action.

Because the preposition με means with, and it takes the accusative case in Modern Greek.

So:

• η προϊσταμένη = the supervisor (nominative)
• την προϊσταμένη = the supervisor (accusative)

Since the phrase is with my supervisor, Greek says:

• με την προϊσταμένη μου

Yes. Η προϊσταμένη refers to a female supervisor / manager / person in charge.

It is the feminine form. The masculine equivalent is:

• ο προϊστάμενος = male supervisor

So this sentence specifically tells us that the speaker’s supervisor is a woman.

The two dots over ϊ show that the ι is pronounced separately, not as part of a combined vowel sound.

So προϊ- is pronounced in separate parts, roughly like pro-i- rather than merging the vowels into one sound.

This mark helps with pronunciation and syllable division.

In Greek, the unstressed possessive forms such as μου, σου, του, της, μας, σας, τους usually come after the noun.

So:

• η προϊσταμένη μου = my supervisor
• literally: the supervisor my

This is the normal Greek pattern.

Here γιατί means because.

So:

• γιατί η νέα σύμβαση και η ασφάλιση δεν είναι ακόμα έτοιμες
  = because the new contract and the insurance are not ready yet

Be aware that γιατί can also mean why in questions:

• Γιατί άργησες; = Why were you late?

So the meaning depends on context.

Greek normally uses the article with each noun when listing separate items like this.

So:

• η νέα σύμβαση = the new contract
• η ασφάλιση = the insurance

When joined:

• η νέα σύμβαση και η ασφάλιση

Repeating the article is natural and standard because these are two distinct things.

Because νέα modifies only σύμβαση.

So the phrase means:

• the new contract and the insurance

not

• the new contract and the new insurance

If the speaker wanted new to apply to both nouns, Greek would usually make that clearer, for example by repeating or restructuring the adjective.

Greek often expresses this idea with είμαι + έτοιμος/η/ο = to be ready.

So:

• δεν είναι ακόμα έτοιμες = they are not ready yet

This is a very natural Greek way to say that something has not been finalized or prepared.

Because it describes two things together:

• η νέα σύμβαση
• η ασφάλιση

These two nouns form a compound subject, so the adjective becomes plural:

• έτοιμες = ready (feminine plural)

In English we also say the contract and the insurance are not ready, not is not ready.

Because both nouns it refers to are feminine singular:

• η σύμβαση = feminine
• η ασφάλιση = feminine

When two feminine singular nouns are joined by και, the agreeing adjective is normally feminine plural:

• έτοιμες

If the nouns were masculine or mixed genders, the form would be different.

In Modern Greek, είναι is the same form for both he/she/it is and they are.

So:

• είναι can mean is
• είναι can also mean are

In this sentence it means are, because the subject is plural:

• η νέα σύμβαση και η ασφάλιση δεν είναι ακόμα έτοιμες
  = the new contract and the insurance are not ready yet

Here ακόμα means yet / still.

So:

• δεν είναι ακόμα έτοιμες = they are not ready yet

Yes, ακόμα and ακόμη are both used in Modern Greek. In many contexts they mean the same thing, and ακόμα is very common in everyday speech.

No, Greek word order is relatively flexible, although some orders sound more natural than others.

This sentence:

• Αύριο θα μιλήσω με την προϊσταμένη μου, γιατί η νέα σύμβαση και η ασφάλιση δεν είναι ακόμα έτοιμες.

is a very natural neutral order.

You could move elements for emphasis, for example:

• Θα μιλήσω αύριο με την προϊσταμένη μου...
• Με την προϊσταμένη μου θα μιλήσω αύριο...

But the original version is straightforward and idiomatic.

Yes, a learner may want to note the nuance:

• σύμβαση = contract / agreement
• ασφάλιση = insurance / coverage / insurance arrangement

Depending on context, ασφάλιση can refer to the process or status of being insured, not just an insurance document. So the sentence could refer to administrative paperwork not being ready yet.

Sometimes, yes, depending on context, but not always.

More literally, προϊσταμένη is:

• supervisor
• manager
• person in charge

Boss is possible in casual English, but supervisor or manager is often a safer translation because it matches the formal workplace tone better.

Because Greek normally keeps the definite article with the noun even when a possessive clitic like μου is added.

So Greek says:

• την προϊσταμένη μου
• literally: the supervisor my

This is completely normal Greek structure. English drops the article in my supervisor, but Greek does not.

You would change the noun phrase to the masculine form:

• Αύριο θα μιλήσω με τον προϊστάμενό μου, γιατί η νέα σύμβαση και η ασφάλιση δεν είναι ακόμα έτοιμες.

Here:

• τον προϊστάμενό μου = with my male supervisor

The rest of the sentence stays the same, because σύμβαση and ασφάλιση are still feminine nouns.

Yes, absolutely. It is a very useful pattern.

You can reuse it with other nouns:

• Τα έγγραφα δεν είναι ακόμα έτοιμα. = The documents aren’t ready yet.
• Η αίτηση δεν είναι ακόμα έτοιμη. = The application isn’t ready yet.
• Οι κάρτες δεν είναι ακόμα έτοιμες. = The cards aren’t ready yet.

Just change έτοιμος / έτοιμη / έτοιμο / έτοιμοι / έτοιμες / έτοιμα to match the noun.