Mi ne scias, ĉu vi pravos morgaŭ, sed via trankvila voĉo helpas min ne koleri.

Ĉu introduces an indirect yes/no question. After a verb like scii (to know), it means whether or if in the sense of uncertainty.

So:

• Mi ne scias, ĉu vi pravos morgaŭ = I don’t know whether you will be right tomorrow.

This is different from se, which is mainly used for conditions:

• Se vi pravos morgaŭ, mi agnoskos tion = If you are right tomorrow, I will admit it.

A very common learner mistake is to use se where Esperanto wants ĉu. After know, ask, wonder, and similar verbs, ĉu is usually the right choice for an indirect yes/no question.

Yes. Pravi is a normal Esperanto verb meaning to be right or to be correct.

The ending -os marks the future tense, so:

• pravas = is right / are right
• pravis = was right / were right
• pravos = will be right

So vi pravos means you will be right.

English often uses to be + adjective here, but Esperanto often uses a simple verb:

• Vi pravas = You are right
• Li eraras = He is mistaken / He is wrong

Morgaŭ tells you when, but -os still marks the verb as future. In normal Esperanto, the verb tense is still usually shown clearly even if a time word is present.

So:

• vi pravos morgaŭ = you will be right tomorrow

This is the most straightforward and standard form.

Using a present tense with morgaŭ is sometimes understandable from context, but Esperanto generally prefers the tense marking to match the time reference. So pravos morgaŭ is exactly what a learner should expect.

Via is the possessive adjective meaning your. It comes from vi.

Like other adjectives in Esperanto, it ends in -a:

• mia = my
• via = your
• lia = his
• ŝia = her

In via trankvila voĉo, via modifies voĉo just like an adjective does.

There is normally no article before a possessive adjective:

• via voĉo = your voice
• not normally la via voĉo

That is similar to English, where you say your voice, not the your voice.

Also, because voĉo is singular and not accusative here, via stays in its basic form. If the noun were plural or accusative, it would agree:

• viaj voĉoj = your voices
• vian voĉon = your voice (as a direct object)

Because trankvila is an adjective, and it describes the noun voĉo.

• trankvila voĉo = a calm voice

The form trankvile is an adverb, which would describe a verb, adjective, or another adverb:

• Li parolas trankvile = He speaks calmly

So:

• trankvila voĉo = calm voice
• parolas trankvile = speaks calmly

English sometimes uses similar-looking forms in ways that blur the distinction, but Esperanto keeps adjective -a and adverb -e very regular.

In the second clause, via trankvila voĉo helpas min ne koleri, the thing doing the helping is via trankvila voĉo.

So grammatically:

• via trankvila voĉo = subject
• helpas = verb
• min = direct object
• ne koleri = infinitive phrase explaining what the help is about

That means Esperanto is structured very directly here: your calm voice helps me not be/get angry.

Even though English speakers may think of voice as a less typical subject, Esperanto allows this very naturally.

Because min is the direct object of helpas. The person being helped is the object.

So:

• helpi iun = to help someone
• helpi min = to help me
• helpi vin = to help you

In this sentence:

• via trankvila voĉo helpas min = your calm voice helps me

Then ne koleri adds what it helps you do:

• helpas min ne koleri = helps me not get angry / helps me avoid anger

This pattern is very common in Esperanto:

• Tio helpas min labori = That helps me work
• La instruisto helpis nin kompreni = The teacher helped us understand

Because after helpas, Esperanto uses the infinitive to show the action involved.

So the structure is:

• helpi iun fari ion = to help someone do something

That gives:

• helpas min ne koleri = helps me not be/get angry

If you said ne koleras, that would be a finite verb form, and it would not fit this construction.

Compare:

• Mi ne koleras = I am not angry
• Tio helpas min ne koleri = That helps me not be/get angry

The first is a full statement. The second uses an infinitive because it depends on helpas.

Strictly speaking, koleri means to be angry, while koleriĝi means to become angry or to get angry.

So there is a nuance:

• koleri = be angry
• koleriĝi = become angry

However, in real usage, ne koleri can often naturally correspond to English not get angry, especially in a context like this one. It suggests avoiding anger, not entering an angry state, or not responding angrily.

If the speaker wanted to emphasize the change of state more strongly, ne koleriĝi would also be possible, but it would feel a bit more explicit.

So the sentence as written is perfectly natural. It focuses on not being angry / not reacting with anger, rather than on the precise moment of becoming angry.

The commas separate parts of the sentence in a very standard way.

1. Before ĉu
   The phrase ĉu vi pravos morgaŭ is a subordinate clause: an indirect question depending on Mi ne scias. A comma before that clause is normal and clear.

2. Before sed
   Sed joins two main clauses:

   • Mi ne scias, ĉu vi pravos morgaŭ
   • via trankvila voĉo helpas min ne koleri

A comma before sed is standard, just as English often uses a comma before but between two full clauses.

So the punctuation here is very ordinary and learner-friendly.

Esperanto word order is fairly flexible, but this sentence uses the most neutral and natural order.

The original order is easy to follow:

• Mi ne scias, ĉu vi pravos morgaŭ, sed via trankvila voĉo helpas min ne koleri.

Some parts could move without changing the basic meaning, for example:

• Mi ne scias, ĉu morgaŭ vi pravos...
• ...sed min helpas via trankvila voĉo ne koleri.

But these alternatives may sound more marked, less neutral, or slightly less smooth.

For learners, the best rule is:

• subject before verb
• object after verb
• adjectives before the noun
• infinitive after verbs like helpi

So the original sentence is a very good model of normal Esperanto style.

Yes, but pravi is usually the more natural Esperanto choice.

Compare:

• vi pravos = you will be right
• vi estos prava = you will be right

Both are understandable, but pravi is the ordinary, idiomatic verb for this idea. Esperanto often prefers a simple verb where English uses to be + adjective.

So learners should get used to patterns like:

• pravi = be right
• erari = be wrong / make a mistake
• sufiĉi = be enough
• utili = be useful

Using pravi makes the sentence sound more natural and more typically Esperanto.