Υποστηρίζω αυτή τη συνεργασία, γιατί νομίζω ότι θα βοηθήσει και τις δύο ομάδες.

Υποστηρίζω is the 1st person singular present tense form of the verb υποστηρίζω.

So it means I support.

A few related forms:

• υποστηρίζω = I support
• υποστηρίζεις = you support
• υποστηρίζει = he/she/it supports
• υποστηρίζουμε = we support
• υποστηρίζετε = you (plural) support
• υποστηρίζουν = they support

In this sentence, the speaker is saying what they support now / in general, so the present tense is natural.

Because συνεργασία is:

• feminine
• singular
• the direct object of Υποστηρίζω

So Greek uses the accusative singular feminine form:

• αυτή = this
• τη συνεργασία = the cooperation/collaboration

More literally, Greek is saying:

• I support this collaboration

Compare:

• αυτή η συνεργασία = this collaboration (subject, nominative)
• υποστηρίζω αυτή τη συνεργασία = I support this collaboration (object, accusative)

So the case changes because the noun is the thing being supported, not the subject of the sentence.

Both are possible in Greek spelling, but τη is very common before certain consonants in modern usage.

The full accusative feminine singular article is την, but the final -ν is often dropped before many consonants. So:

• την ομάδα
• τη συνεργασία

In modern Greek, the final -ν is usually kept before:

• vowels
• κ, π, τ
• γκ, μπ, ντ
• ξ, ψ

Since συνεργασία starts with σ, dropping the -ν is normal:

• τη συνεργασία

So this is not a different word—just a normal spelling/pronunciation pattern.

Here γιατί means because.

It introduces the reason:

• Υποστηρίζω αυτή τη συνεργασία, γιατί...
• I support this collaboration, because...

A learner often notices that γιατί can also mean why. That is true:

• Γιατί έφυγες; = Why did you leave?
• Έφυγα γιατί ήμουν κουρασμένος. = I left because I was tired.

So the same word can mean:

• why in questions
• because in answers/explanations

The sentence structure makes the meaning clear.

Ότι means that and introduces a subordinate clause.

So:

• νομίζω ότι... = I think that...

In English, that is often optional:

• I think that it will help
• I think it will help

In Greek, ότι is very commonly used and sounds natural here.

So the structure is:

• νομίζω = I think
• ότι θα βοηθήσει... = that it will help...

This is a very common Greek pattern:

• ξέρω ότι... = I know that...
• πιστεύω ότι... = I believe that...
• λέω ότι... = I say that...

Θα βοηθήσει is the future tense: it will help.

It is made with:

• θα
  • a verb form

Here:

• βοηθήσει comes from βοηθώ / βοηθάω = to help

This future form refers to one complete future result/action:

• it will help

That is why Greek uses the form βοηθήσει rather than a present-style form.

A useful comparison:

• θα βοηθήσει = it will help / it will be helpful
• θα βοηθά = it will be helping / it will help repeatedly or continuously

In this sentence, the speaker means a general future outcome of the collaboration, so θα βοηθήσει is the natural choice.

Greek often omits subject pronouns when they are not needed, because the verb ending usually gives enough information.

So instead of saying:

• αυτό θα βοηθήσει = it will help

Greek can simply say:

• θα βοηθήσει

Here the understood subject is something like:

• this collaboration or
• it

This is very normal in Greek. Subject pronouns such as εγώ, εσύ, αυτός, αυτή, αυτό are used mainly for:

• emphasis
• contrast
• clarity when needed

So the sentence sounds natural without an explicit it.

In this sentence, και τις δύο ομάδες means both groups or the two groups as well, depending on context. Here it is best understood as both groups.

Breakdown:

• τις ομάδες = the groups (feminine plural accusative)
• δύο = two
• και here adds the sense of both

This is a common Greek pattern:

• και οι δύο = both
• και τα δύο = both
• και τις δύο ομάδες = both groups

Examples:

• και οι δύο φίλοι = both friends
• και τα δύο παιδιά = both children
• και τις δύο ομάδες = both groups

So the και is not simply the basic English and here. In this structure, it helps express both.

Because ομάδες is:

• feminine
• plural
• accusative (it is the object of βοηθήσει)

So everything around it matches that:

• τις = feminine plural accusative article
• δύο = two
• ομάδες = groups (feminine plural accusative)

Compare:

• οι δύο ομάδες = the two groups / both groups (subject, nominative)
• τις δύο ομάδες = the two groups / both groups (object, accusative)

Since the collaboration will help the groups, the groups are the object, so accusative is required.

No—δύο is indeclinable, so it stays the same.

That means it does not change for:

• gender
• case
• number

Examples:

• δύο ομάδες = two groups
• δύο βιβλία = two books
• δύο φίλοι = two friends
• βλέπω δύο ομάδες = I see two groups
• οι δύο ομάδες = the two groups

What changes is usually the article and the noun, not δύο itself.

Yes, Greek word order is more flexible than English, although the original order is very natural.

Original:

• Υποστηρίζω αυτή τη συνεργασία, γιατί νομίζω ότι θα βοηθήσει και τις δύο ομάδες.

This is neutral and clear.

Possible variations:

• Αυτή τη συνεργασία υποστηρίζω, γιατί νομίζω ότι θα βοηθήσει και τις δύο ομάδες.
• Νομίζω ότι αυτή η συνεργασία θα βοηθήσει και τις δύο ομάδες, γι’ αυτό την υποστηρίζω.

Changing the order usually changes:

• emphasis
• style
• sometimes tone

But for a learner, the original sentence is a very good standard model.

A rough pronunciation guide:

Ypostirízo aftí ti synergasía, yatí nomízo óti tha voithísi ke tis dýo omádes.

A few notes:

• Υποστηρίζω → stress on -ρί-
• αυτή → stress on the second syllable
• συνεργασία → stress on -σί-
• γιατί → stress on the second syllable
• νομίζω → stress on -μί-
• βοηθήσει → stress on -θή-
• ομάδες → stress on μά

Also:

• αι is pronounced like e
• οι is pronounced like i
• η / ι / υ all sound like i in modern Greek

So:

• ομάδες sounds roughly like omáthes / omádes depending on how detailed your pronunciation system is
• βοηθήσει sounds roughly like voithísi

Because γιατί νομίζω ότι θα βοηθήσει και τις δύο ομάδες is a clause giving the reason for the first statement.

So the comma separates:

• the main statement: Υποστηρίζω αυτή τη συνεργασία
• the reason: γιατί νομίζω ότι θα βοηθήσει και τις δύο ομάδες

This is similar to English:

• I support this collaboration, because I think it will help both groups.

In Greek punctuation, this comma is very normal and helps readability.