Echipa joacă împotriva adversarului.

Echipa means the team. Romanian often puts the definite article at the end of the noun instead of using a separate word like English the.

• echipă = team
• echipa = the team

So in this sentence, the subject is a specific team: the team.

Joacă is the 3rd person singular present tense of a juca (to play).

Here it matches echipa because echipa is singular:

• eu joc = I play
• tu joci = you play
• el/ea joacă = he/she plays
• echipa joacă = the team plays

Even though a team is made up of many people, grammatically echipa is singular, so the verb is singular too.

Romanian often leaves out subject pronouns when they are not needed, because the verb form already shows the person and number.

So:

• Joacă already tells you it is he/she/it plays
• Echipa joacă is completely natural
• Ea joacă would only be added for emphasis or contrast

This is different from English, where a subject pronoun is usually required if there is no noun subject.

Because împotriva normally requires the genitive case in Romanian.

That means the noun after it changes form:

• adversarul = the opponent (basic subject/object form)
• adversarului = of/to the opponent / genitive-dative form

After împotriva, Romanian uses that genitive form:

• împotriva adversarului = against the opponent

This is one of the most important things to notice in the sentence.

Adversarului is made up of:

• adversar = opponent
• -ul = the
• -ui / -ului = genitive-dative ending for a masculine singular definite noun

So:

• adversar = opponent
• adversarul = the opponent
• adversarului = of/to the opponent

After împotriva, you need this last form.

Yes, in normal standard Romanian, împotriva is followed by the genitive.

Examples:

• împotriva vântului = against the wind
• împotriva regulilor = against the rules
• împotriva adversarului = against the opponent

So if you learn împotriva, it is helpful to learn it together with the rule: împotriva + genitive.

No, that would usually not work here.

• a juca = to play, to play a game/sport
• a se juca = to play, but more like to play around, to amuse oneself, or children playing

For sports or competitive games, you normally use a juca:

• Echipa joacă împotriva adversarului.

If you said se joacă, it would sound like a different meaning.

Sometimes yes, but the meaning is a little different.

• joacă împotriva adversarului = plays against the opponent
• joacă cu adversarul = literally plays with the opponent, but in sports context it can mean plays against or plays with depending on context

If you want to make the idea of opposition very clear, împotriva is more explicit.

The sentence Echipa joacă împotriva adversarului is the most neutral word order.

Romanian word order is fairly flexible, so other orders are possible for emphasis, such as:

• Împotriva adversarului joacă echipa.

But that sounds more marked or literary. For a learner, the normal pattern is:

subject + verb + prepositional phrase

So Echipa joacă împotriva adversarului is the safest and most natural version.

A few sounds may stand out to an English speaker:

• ă in joacă and echipă is a short central vowel, somewhat like the a in sofa
• î in împotriva is a close central vowel, a sound English does not really have
• c before ă in joacă is a hard k sound: joa-kă
• ch in echipa is also a k sound: e-ki-pa

A rough pronunciation guide:

• Echipa ≈ eh-KEE-pa
• joacă ≈ ZHWA-kə
• împotriva ≈ îm-po-TREE-va
• adversarului ≈ ad-ver-SA-ru-luy

This is only approximate, but it helps with the main sounds.

Because împotriva itself just means against, and the definiteness belongs to the noun after it.

In English:

• against the opponent

In Romanian:

• împotriva adversarului

The the is not a separate word. It is built into adversarului through the ending.

Yes. Romanian present tense often covers both English simple present and present continuous, depending on context.

So joacă can mean:

• plays
• is playing

In a sports context, either may be possible depending on the situation. Romanian does not need a separate form like English is playing in many cases.