Cheamă echipa acum.

Cheamă comes from the verb a chema, which usually means to call, to summon, or to ask someone to come.

In this sentence, cheamă is the 2nd person singular imperative:

• Cheamă! = Call!

So the sentence is giving a command to one person.

A useful thing to know is that cheamă is also identical in spelling to the 3rd person singular present:

• El/ea cheamă = He/She calls

So by itself, cheamă can be ambiguous, but in a short sentence like this, context tells you it is a command.

Romanian often leaves out subject pronouns when they are not needed. The verb form usually makes the person clear enough.

In commands, this is especially normal:

• Cheamă echipa acum. = Call the team now.

If you add tu, it usually sounds emphatic or contrastive:

• Tu cheamă echipa acum. = roughly You call the team now.

So the absence of you is completely natural.

Because echipa means the team, while echipă means team in a more basic dictionary form.

Romanian usually puts the definite article at the end of the noun:

• echipă = team
• echipa = the team

So:

• Cheamă echipa acum. = Call the team now.

If you wanted a team, you would say:

• o echipă = a team

Acum means now.

In Romanian, adverbs like acum can often move around:

• Cheamă echipa acum.
• Cheamă acum echipa.
• Acum cheamă echipa.

These all can work, but the emphasis changes slightly.

The version you have,

• Cheamă echipa acum. is a very natural way to say Call the team now.

Not always. A chema often means to call/summon someone, to send for someone, or to ask someone to come.

So:

• Cheamă echipa acum. may mean Get the team here now or Summon the team now.

If you want to be very specifically about a phone call, Romanian often uses a suna:

• Sună echipa acum. = Call the team now / Phone the team now

So a chema is broader than English to call in the phone sense.

Yes. The verb a chema is very common and can appear in a few related meanings.

For example:

• Îl cheamă Andrei. = His name is Andrei.
• Se cheamă Maria. = She is called Maria.

That is the same verb family, but in your sentence:

• Cheamă echipa acum. it clearly means call/summon the team because it has a direct object, echipa.

A rough guide is:

• cheamă ≈ KEA-muh
• echipa ≈ eh-KEE-pah
• acum ≈ ah-KOOM

A few useful pronunciation notes:

• ch before e or i sounds like k, not like English ch
• ă is the Romanian mid-central vowel, similar to the a in about
• Stress is usually:
  • CHEA-mă
  • e-CHI-pa
  • a-CUM

So the whole sentence sounds roughly like: KEA-muh eh-KEE-pah ah-KOOM

Because echipa is the direct object of the verb cheamă.

In Romanian, direct objects usually appear without a preposition:

• Cheamă echipa. = Call the team.

English learners sometimes expect a preposition because some Romanian objects use pe, but pe is mainly used with specific people or strongly individualized animate objects:

• Cheamă-l pe Andrei. = Call Andrei.

With echipa, pe is normally not used.

For you plural or formal you, Romanian uses:

• Chemați echipa acum.

So:

• Cheamă echipa acum. = command to one person, informal
• Chemați echipa acum. = command to several people, or to one person formally

This is a very useful distinction in Romanian.

You add nu before the verb:

• Nu chema echipa acum. = Don’t call the team now.
• Nu chemați echipa acum. = Don’t call the team now. (plural/formal)

So the negative command is very straightforward:

• nu + verb

Yes, it is natural Romanian.

It sounds like a direct instruction, especially in a situation where someone needs to contact or summon the team immediately.

Depending on context, a Romanian speaker might also say:

• Sună echipa acum. if they specifically mean phone the team
• Cheamă-i acum. = Call them now, if the team is already understood

But Cheamă echipa acum. is perfectly normal and clear.