Esimies arvioi tuloksen yhdessä tiimin kanssa.

The neutral structure is:

• Esimies = subject
• arvioi = verb
• tuloksen = object
• yhdessä tiimin kanssa = adverbial phrase (together with the team)

So the sentence follows a fairly familiar subject–verb–object pattern, with an extra phrase added at the end.

Finnish word order is more flexible than English word order, but this version sounds natural and neutral.

Arvioi is the 3rd person singular form of arvioida.

Because the subject is esimies (supervisor/manager), Finnish uses the he/she/it form of the verb:

• minä arvioin = I assess
• sinä arvioit = you assess
• hän arvioi = he/she assesses
• esimies arvioi = the supervisor assesses

A useful extra detail: with this verb, arvioi can look the same in both present and past. So by itself, the sentence can be ambiguous unless the context makes the time clear.

For example:

• Nyt esimies arvioi tuloksen. = Now the supervisor is assessing the result.
• Eilen esimies arvioi tuloksen. = Yesterday the supervisor assessed the result.

Because tuloksen is the object form used here.

In this sentence, the action is viewed as applying to the whole result as a complete item, so Finnish uses the total object. In the singular, that often looks like the genitive form, which ends in -n.

So:

• tulos = result (basic dictionary form)
• tuloksen = the result, as a total object in this sentence

In an ordinary affirmative active sentence like this one, a singular total object usually does not stay in the plain nominative form.

Tulosta would be the partitive form, and that would change the meaning or at least the viewpoint.

Compare:

• arvioi tuloksen = assessed/evaluated the result as a whole
• arvioi tulosta = was assessing/evaluating the result in a more ongoing, incomplete, or partial sense

So the sentence with tuloksen presents the result as a complete, bounded object of the action.

This is a very common Finnish contrast:

• luin kirjan = I read the whole book
• luin kirjaa = I was reading a book / I read some of the book

Because tulos belongs to a noun type where the stem changes in other cases.

So the word does not behave like:

• tulos → tulosn ✘

Instead, it behaves like:

• tulos → tuloksen

Many Finnish nouns ending in -s do this kind of stem change. For example:

• tulos → tuloksen
• päätös → päätöksen
• kysymys → kysymyksen

This is just part of Finnish noun inflection, so it is something learners mostly have to get used to word by word and by pattern.

Because kanssa is a postposition meaning with, and it requires the noun before it to be in the genitive.

So:

• tiimi = team
• tiimin = team's / of the team (genitive form)
• tiimin kanssa = with the team

This may feel unusual to an English speaker because English uses a preposition before the noun:

• with the team

Finnish uses a postposition after the noun:

• tiimin kanssa

It can look repetitive at first, but it is a very natural Finnish combination.

• yhdessä = together
• tiimin kanssa = with the team

Together, yhdessä tiimin kanssa means together with the team.

You can often say just:

• Esimies arvioi tuloksen tiimin kanssa.

That is still grammatical. But adding yhdessä makes the sense of joint action clearer and stronger: the supervisor did it together with the team, not just in the team's presence.

Not necessarily.

Even though mies literally means man, the job title esimies has traditionally been used for a supervisor or manager regardless of gender.

That said, many speakers today prefer the more explicitly gender-neutral word:

• esihenkilö

So depending on the speaker, workplace, or style, you may hear either:

• esimies
• esihenkilö

Finnish itself does not have grammatical gender like he/she built into nouns.

Because Finnish has no articles.

So Finnish usually does not have separate words corresponding directly to English a/an and the.

That means words like:

• esimies
• tuloksen
• tiimin

can be understood as a supervisor / the supervisor, a result / the result, a team / the team, depending on context.

If Finnish needs to be more explicit, it can use other words such as:

• se = that / the one in context
• tämä = this
• yksi = one / a certain
• eräs = a certain

But very often, context does the job.

Yes. Finnish word order is flexible, and changing it often changes focus rather than core meaning.

For example:

• Esimies arvioi tuloksen yhdessä tiimin kanssa.
  Neutral, straightforward order.

• Yhdessä tiimin kanssa esimies arvioi tuloksen.
  Puts more focus on together with the team.

• Tuloksen esimies arvioi yhdessä tiimin kanssa.
  Puts more focus on the result.

So the original sentence is a good neutral version, but it is not the only possible one.

Yhdessä is an adverb. Here it means together.

It does not agree with another word the way adjectives do; it simply describes how the action happened.

So in this sentence, it tells us that the evaluating was done jointly.

You will often see it in phrases like:

• tehdä yhdessä = do together
• yhdessä ystävien kanssa = together with friends
• asua yhdessä = live together