Αυτή την εβδομάδα κάνουμε έρευνα για το πώς δουλεύει η ομάδα μας, και όλοι πρέπει να απαντήσουμε στο ίδιο ερωτηματολόγιο.

Because αυτή την εβδομάδα is a time expression meaning this week in the sense of during this week. Greek often uses the accusative for expressions of time like this.

• Αυτή η εβδομάδα = this week as the subject of a sentence
• Αυτή την εβδομάδα = this week / during this week

So here, the sentence means during this week, we are doing a survey.

In Greek, a demonstrative like αυτή (this) is normally used together with the definite article.

So:

• αυτή την εβδομάδα = this week
• literally: this the week

That is completely normal Greek structure. English does not do this, but Greek usually does.

Literally, κάνουμε έρευνα means we do research or we carry out a survey/investigation. Yes, it is very natural Greek.

Greek often uses κάνω with nouns in places where English uses a single verb. So:

• κάνουμε έρευνα = we are doing/carrying out research
• ερευνούμε also exists, but it is often more formal or narrower in use

In this sentence, κάνουμε έρευνα sounds normal and everyday.

They are related, but they are not the same thing.

• έρευνα = research, survey, investigation
• ερωτηματολόγιο = questionnaire

So in the sentence:

• κάνουμε έρευνα = we are conducting a survey/research
• να απαντήσουμε στο ίδιο ερωτηματολόγιο = to answer the same questionnaire

The questionnaire is the tool, while the survey/research is the overall process.

για το πώς means something like about how.

So:

• για το πώς δουλεύει η ομάδα μας = about how our team works/functions

This structure is very common in Greek when a whole clause is treated like a thing or topic.

You do not need to translate it word for word. It is best understood as:

• για = about
• το πώς... = how...

Together: about how...

The article το helps turn πώς δουλεύει η ομάδα μας into something like a noun phrase: the way our team works or how our team works as a topic.

So:

• για το πώς δουλεύει η ομάδα μας = about how our team works

Without το, the phrase would not sound right here in standard Greek. This is a common pattern with words like πώς, γιατί, and αν in certain structures.

Here it means functions, operates, or works in the sense of how the team works as a group.

Greek δουλεύω can be used for:

• people working
• machines working
• systems functioning
• organizations or teams operating

So πώς δουλεύει η ομάδα μας means how our team works/functions, not how our team is employed.

Because η ομάδα is singular.

Even though a team contains many people, the noun ομάδα itself is singular, so the verb must also be singular:

• η ομάδα δουλεύει = the team works

This is similar to English the team works, although English sometimes treats collective nouns differently depending on dialect.

In standard Greek, the weak possessive form μου, σου, μας, σας, τους usually comes after the noun:

• η ομάδα μας = our team

That is the normal word order.

If you want extra emphasis, Greek often uses:

• η δική μας ομάδα = our team / our own team

But in a neutral sentence, η ομάδα μας is exactly what you expect.

Because the speaker is included in όλοι.

• όλοι πρέπει να απαντήσουμε = we all have to answer
• όλοι πρέπει να απαντήσουν = they all have to answer

Even though όλοι is third person in form, the verb in the να clause matches the people meant by the speaker. Here, the meaning is all of us, so Greek uses first person plural:

• απαντήσουμε = we answer / we should answer

Because να απαντήσουμε is the aorist subjunctive, and here it expresses a single complete action: answering the questionnaire.

• να απαντήσουμε = to answer once, as a complete act
• να απαντάμε = to be answering / to answer regularly or repeatedly

Since the sentence is about filling in one questionnaire, the aorist form is the natural choice.

Because the verb απαντώ normally takes σε when you answer a question, questionnaire, email, etc.

So:

• απαντώ σε κάτι = I answer something
• σε το becomes στο

That gives:

• στο ίδιο ερωτηματολόγιο = to the same questionnaire

So the structure is:

• να απαντήσουμε στο ίδιο ερωτηματολόγιο

not just το ίδιο ερωτηματολόγιο by itself.

Here ίδιο means same.

So:

• το ίδιο ερωτηματολόγιο = the same questionnaire

It agrees with ερωτηματολόγιο, which is:

• neuter
• singular
• accusative here after στο

That is why the form is ίδιο.

Not always strictly necessary, but it is very common and natural here because και links two full clauses:

• Αυτή την εβδομάδα κάνουμε έρευνα...
• όλοι πρέπει να απαντήσουμε...

The comma helps readability and marks a small pause. In modern Greek, writers sometimes include it and sometimes omit it before και, especially when the second part is a full clause.

Yes. In practice, Αυτή την εβδομάδα naturally means this week in the time frame relevant to the speaker. It can cover ideas like:

• during this week
• this week, as opposed to last week or next week
• at some point in the current week

So English this week is a very good match.