Nu pot vorbi acum, pentru că profesoara este ocupată cu alt grup.

Because Romanian often drops subject pronouns. The verb form already tells you who the subject is.

• pot = I can
• so Nu pot vorbi acum already means I can’t speak now

You can add eu if you want emphasis: Eu nu pot vorbi acum, but the version without it is more neutral and very common.

Pot is the 1st person singular, present tense of a putea = to be able / can.

So:

• pot = I can
• poți = you can
• poate = he/she can

In this sentence, Nu pot means I can’t.

After a putea, Romanian commonly uses the short infinitive:

• pot vorbi = I can speak

The full dictionary form is a vorbi, but after another verb you normally drop a, so you get vorbi.

Romanian also allows:

• pot să vorbesc

That version uses the subjunctive and is also very common. So both are correct:

• Nu pot vorbi acum
• Nu pot să vorbesc acum

In Romanian, nu is the basic negative particle, and it normally goes directly before the conjugated verb.

So:

• pot = I can
• nu pot = I can’t

This is the normal pattern in Romanian:

• vreau → nu vreau
• știu → nu știu
• este → nu este

Pentru că means because and introduces the reason:

• Nu pot vorbi acum = main idea
• pentru că profesoara este ocupată cu alt grup = the reason

The comma is standard here because pentru că introduces a subordinate clause after the main clause.

So the structure is basically:

[main clause], pentru că [reason clause]

Profesoară is the indefinite form: a teacher.

Profesoara is the definite form: the teacher.

Romanian usually adds the definite article to the end of the noun instead of using a separate word like English the.

So:

• profesoară = a teacher
• profesoara = the teacher

This is why the sentence uses profesoara: it means the teacher, not just a teacher.

Because it has to agree with profesoara, which is feminine singular.

In Romanian, adjectives usually agree with the noun in gender and number.

• profesorul este ocupat = the male teacher is busy
• profesoara este ocupată = the female teacher is busy

So the ending -ă shows feminine singular agreement.

Here cu means with, and Romanian uses it naturally after ocupat/ocupată to say what someone is busy with.

So:

• ocupată cu alt grup = busy with another group

This is a normal Romanian pattern. It does not have to match English word-for-word perfectly; it is just the natural way to express the idea.

Both are possible.

• cu alt grup
• cu un alt grup

In this sentence, alt grup is perfectly natural and means another group. The word alt already carries the idea of another/other, so un can be left out.

Also notice the form:

• grup is masculine singular
• so the adjective is alt
• with a feminine singular noun, it would be altă

For example:

• alt grup
• altă clasă

Este and e both mean is.

• este = full form
• e = shorter, very common in speech

So these are both correct:

• profesoara este ocupată
• profesoara e ocupată

The sentence uses este, which sounds a bit more neutral or standard in writing.

Yes, they matter.

Romanian diacritics are part of correct spelling, and they can change the word.

For example:

• că = that or part of because in pentru că
• ca = like / as

So writing ca instead of că can change the meaning.

In ocupată, the final ă is also important. Standard Romanian should be written with the correct diacritics.

Yes, Romanian word order is fairly flexible, but the original sentence is the most neutral.

For example, you could also say:

• Acum nu pot vorbi, pentru că profesoara este ocupată cu alt grup.

That puts more emphasis on acum = now.

But Nu pot vorbi acum, pentru că profesoara este ocupată cu alt grup is a very natural standard order.