Ternyata dia diam-diam sudah membaca aturan perpustakaan dari awal, jadi dia tidak bingung sama sekali.

Ternyata means something like it turns out, apparently, or as it turned out. It signals that the speaker has just realized something, or is presenting information that may be surprising.

In this sentence, Ternyata dia diam-diam sudah membaca aturan perpustakaan dari awal means: It turns out that he/she had secretly already read the library rules from the beginning.

Putting ternyata at the beginning sets the tone for the whole sentence: the speaker is revealing a fact that explains what follows.

Dia can mean either he or she. Indonesian pronouns usually do not show gender.

So:

• dia sudah membaca = he has already read / she has already read

You need context to know which one is meant.

Diam-diam is a common reduplicated form meaning secretly, quietly, or without others knowing.

Even though diam by itself means silent or quiet, diam-diam is an established adverb with a slightly different meaning. It often suggests that someone did something without drawing attention to it.

So:

• dia diam-diam membaca = he/she read it secretly / without telling anyone

It does not necessarily mean anything bad or dishonest. It can simply mean the action was done privately.

Sudah usually means already. It marks that an action has happened before the relevant moment, or that it is completed.

So:

• dia sudah membaca = he/she has already read
• dia membaca = he/she reads / was reading / read depending on context

In this sentence, sudah helps explain why the person was not confused later: they had already read the rules.

Indonesian does not change verbs for tense the way English does. The verb membaca stays the same. Time is usually shown by context or by extra words such as:

• sudah = already
• sedang = in progress
• akan = will

So membaca itself just means read in a general sense, and sudah membaca tells you it happened already.

Aturan perpustakaan literally means rules library, but in natural English that becomes library rules.

Indonesian noun phrases usually put the main noun first and the describing noun after it:

• aturan = rules
• perpustakaan = library

So:

• aturan perpustakaan = library rules
• literally: rules of the library

This is a very common word order in Indonesian.

Dari awal means from the beginning.

In this sentence, it most likely means the person read the rules from the beginning, meaning they started at the start of the rules and read through them properly.

Depending on context, dari awal can sometimes also mean from the start of the situation or right from the beginning, but here the most natural reading is that it modifies membaca:

• sudah membaca aturan perpustakaan dari awal = had already read the library rules from the beginning

Jadi here means so, therefore, or as a result. It connects the first clause to the consequence in the second clause.

Structure:

• Ternyata dia ... sudah membaca aturan perpustakaan dari awal = It turns out he/she had already read the library rules from the beginning
• jadi dia tidak bingung sama sekali = so he/she was not confused at all

So jadi introduces the result of what happened earlier.

Bingung means confused.

In Indonesian, you often do not need a separate verb like to be. So:

• dia bingung = he/she is confused
• dia tidak bingung = he/she is not confused

This is normal in Indonesian. Adjectives can function directly as predicates.

Sama sekali means at all when used with a negative.

So:

• tidak bingung sama sekali = not confused at all

It adds emphasis. Compare:

• dia tidak bingung = he/she was not confused
• dia tidak bingung sama sekali = he/she was not confused at all

This is a very common pattern:

• tidak tahu sama sekali = not know at all
• tidak takut sama sekali = not afraid at all

Yes, it is natural. Indonesian often places words like diam-diam and sudah before the verb.

Here the order is:

• dia = subject
• diam-diam = secretly
• sudah = already
• membaca = read

So: dia diam-diam sudah membaca = he/she had secretly already read

This may feel adverb-heavy to an English speaker, but it is normal in Indonesian to stack these kinds of modifiers before the verb.

Yes. A few natural translations are:

• It turned out that he/she had secretly already read the library rules from the beginning, so he/she wasn’t confused at all.
• As it turned out, he/she had quietly read the library rules from the start, so he/she wasn’t confused at all.
• It turned out that he/she had already read the library rules beforehand, without telling anyone, so he/she was not confused at all.

The exact English wording can change, but the key ideas are:

• surprise/discovery: ternyata
• done privately: diam-diam
• completed earlier: sudah
• result: jadi
• strong negation: tidak ... sama sekali