Υποθέτεις ότι θα βρεις συνεργάτη που να είναι διαθέσιμος αύριο το πρωί;

Because Greek future is formed with θα + a verb form, and here the verb is in the perfective non-past form: βρεις.

• Base verb: βρίσκω = find
• Future: θα βρω / θα βρεις / θα βρει...

So θα βρεις means you will find.

Learners often expect something like an infinitive after θα, but Modern Greek does not use an infinitive the way English does. Instead, it uses a finite verb form.

Also, βρεις here is not past tense. It is the form Greek uses for a single, complete future event.

This is a question of aspect.

• θα βρεις = you will find, as a single completed event
• θα βρίσκεις = you will be finding / you will find regularly, repeatedly, or over time

In this sentence, the speaker is asking about one specific future result: whether you’ll manage to find a collaborator for tomorrow morning. That is why θα βρεις is the natural choice.

Ότι introduces a content clause, like English that:

• Υποθέτεις ότι... = Do you suppose/assume that...

It connects the main verb υποθέτεις with the idea being supposed.

In many contexts, Greek can also use πως instead of ότι with this meaning. So Υποθέτεις πως... would also be possible.

Υποθέτεις is the 2nd person singular present of υποθέτω.

So it means:

• you suppose
• you assume

In a question, it can sound like:

• Do you suppose...?
• Do you assume...?
• sometimes more naturally in English, Do you think...?

It is addressed to one person.
If you were speaking to more than one person, or using the formal singular, you would say υποθέτετε.

Because συνεργάτη is being used as a non-specific object: the sentence means finding a collaborator, not a particular known one.

Greek often leaves out the indefinite article in cases like this.

So:

• θα βρεις συνεργάτη = you will find a collaborator
• θα βρεις έναν συνεργάτη = you will find one/a collaborator

Adding έναν is possible, but it may sound slightly more emphatic or specific. Without it, the sentence is very natural.

Because it is the accusative singular form of συνεργάτης.

• nominative: ο συνεργάτης
• accusative: τον συνεργάτη

It is in the accusative because it is the direct object of βρεις:

• find whom? → συνεργάτη

That is why the ending changes from -ης to -η.

Here που introduces a relative clause and means something like who/that.

So:

• συνεργάτη που... = a collaborator who/that...

In Modern Greek, που is very common as a relative word and is much less complicated than English who/whom/that/which. It does not change form.

This is one of the most important points in the sentence.

που να είναι is used because the collaborator is not known to exist yet. The speaker is talking about a desired or possible person:

• a collaborator who would be available
• a collaborator that is available / who may be available

This use of που + να is common after an indefinite or searched-for noun, especially after ideas like finding, looking for, wanting, needing, etc.

So:

• συνεργάτη που να είναι διαθέσιμος = a collaborator who is available / who would be available
• συνεργάτη που είναι διαθέσιμος would sound more like a collaborator who is in fact available, as if such a person is already known or taken as real

So που να είναι adds a sense of possibility, requirement, or sought-after quality.

Because διαθέσιμος is the predicate adjective of είναι, and it agrees with the subject of that clause, not with the case of συνεργάτη in the main clause.

Inside the relative clause, the understood subject is the collaborator:

• που να είναι διαθέσιμος = who may be available

After είμαι, Greek normally uses the adjective in the nominative:

• είναι διαθέσιμος
• είναι έτοιμος
• είναι κουρασμένος

So even though συνεργάτη is accusative in the main clause, within the embedded clause the person referred to is the subject of είναι, and the adjective appears as διαθέσιμος.

Να is the particle that introduces the subjunctive in Modern Greek.

So:

• να είναι = that he/she be, that he/she may be, to be

In this sentence, it does not translate neatly word-for-word into English. Its job is grammatical: it helps express possibility / requirement / non-factual reference.

That fits the meaning here, because the speaker is talking about a collaborator not yet identified.

It means tomorrow morning.

Literally, it is:

• αύριο = tomorrow
• το πρωί = the morning / in the morning

Together, they form a natural time expression:

• αύριο το πρωί = tomorrow morning

This is just a standard Greek way to express time. You will often see similar patterns:

• σήμερα το βράδυ = tonight / this evening
• αύριο το απόγευμα = tomorrow afternoon

Because in Greek, the question mark is written as ;

So:

• Greek ; = English ?

This often surprises learners at first.

A Greek sentence ending in ; is simply a question.

As written, it is addressed to one person with the 2nd person singular:

• υποθέτεις
• θα βρεις

That is the normal singular form.

If you wanted to address someone formally, or speak to more than one person, you would use the plural forms:

• Υποθέτετε ότι θα βρείτε συνεργάτη που να είναι διαθέσιμος αύριο το πρωί;

So the grammar here is singular; whether it feels informal depends on context, but it is not the formal plural form.