Egyszerűen elmondom a szabályt.

It is an adverb, and it describes how the action is done.

So egyszerűen means simply, in a simple way, or plainly.

It modifies elmondom:

• Egyszerűen elmondom = I explain/tell it simply

In this sentence, it does not usually mean just in the sense of only. It is more about the manner: the speaker will explain the rule in a simple, straightforward way.

Because egyszerű is an adjective, meaning simple, and Hungarian often turns adjectives into adverbs with -an / -en.

So:

• egyszerű = simple
• egyszerűen = simply

This is similar to English:

• simple → simply

The exact ending depends on the word, so learners usually memorize the adverb form together with the adjective.

It has three parts:

• el- = a verbal prefix
• mond = the verb stem, related to to say / tell
• -om = I form with a definite object

So elmondom means something like:

• I tell it
• I explain it
• I will tell it

In natural English, depending on context, it may be translated in different ways, but grammatically it is a first-person singular verb form: I ...

Because Hungarian verbs have two kinds of conjugation:

• indefinite conjugation
• definite conjugation

You use the definite conjugation when the verb has a specific, definite object.

Here the object is:

• a szabályt = the rule

That is a definite object, so Hungarian uses the definite verb ending:

• mondok = I say / I am saying something nonspecific
• mondom = I say/tell it, referring to something specific

Since the sentence contains a szabályt (the rule), -om is the correct ending.

The prefix el- often gives the verb a sense of being carried through, completed, or expressed out.

With mond (say), the form elmond commonly means:

• tell
• say fully
• recount
• explain

So while mond is the basic idea of saying, elmond often feels more like telling/explaining something from start to finish.

That is why elmondom a szabályt sounds natural for I explain/tell the rule.

Because szabályt is in the accusative case, which marks the direct object of the verb.

• szabály = rule
• szabályt = rule as the thing being told/explained

Hungarian often adds -t to mark the direct object.

Compare:

• A szabály fontos. = The rule is important.
• Elmondom a szabályt. = I explain the rule.

In the second sentence, the rule is what the speaker is explaining, so it gets the accusative ending -t.

Because a is the Hungarian definite article, meaning the.

So:

• a szabály = the rule
• a szabályt = the rule in the accusative

Hungarian has two forms of the definite article:

• a before most consonant-initial words
• az before vowel-initial words

Since szabály starts with sz, the article is a, not az.

Hungarian word order is more flexible than English word order, and it often reflects focus or emphasis rather than fixed subject-verb-object order.

This sentence is neutral and natural:

• Egyszerűen elmondom a szabályt.

A rough structure is:

• Egyszerűen = manner adverb
• elmondom = verb
• a szabályt = object

This word order sounds like:

• I’ll explain the rule simply
• I simply explain the rule

If you change the order, you can change the emphasis. For example:

• A szabályt mondom el egyszerűen. may put more emphasis on the rule
• Egyszerűen a szabályt mondom el. may suggest it’s the rule that I explain, simply

So the original sentence is a straightforward, neutral version.

Formally, it is present tense.

However, in Hungarian, the present tense is often used for a near future or for something the speaker is about to do, especially when the context makes that clear.

So Elmondom a szabályt can mean:

• I explain the rule
• I’ll explain the rule

Both are possible depending on context.

If someone is about to start explaining, English would often use the future:

• I’ll explain the rule simply.

Yes, but it is built into the verb ending.

The ending -om already tells you the subject is:

• first person singular = I

So Hungarian usually does not need a separate pronoun.

• (Én) elmondom a szabályt.

The word én (I) can be added, but usually only for emphasis:

• Én mondom el a szabályt. = I am the one who will explain the rule.

In the original sentence, the subject is understood from the verb.

A rough learner-friendly pronunciation is:

• eg-say-roo-en el-mon-dom aw sah-baayt

A few useful points:

• gy in egyszerűen is a special Hungarian sound, somewhat like a very soft dy
• sz is pronounced like English s
• zs would be like the s in measure, but that is not in this sentence
• á is a long vowel, so szabály has a longer a-like sound
• stress in Hungarian is almost always on the first syllable of each word:
  • EGYszerűen
  • ELmondom
  • A
  • SZAbályt

If you want to sound natural, keeping that first-syllable stress is very important.