Pomoc je nutná.

Because it describes pomoc, and Czech adjectives must agree with the noun they describe in gender, number, and case.

• pomoc = a feminine singular noun
• so the adjective must also be feminine singular
• nutný is the basic dictionary form
• in this sentence it changes to nutná

So:

• nutný = masculine
• nutná = feminine
• nutné = neuter

In Czech, noun gender is not determined only by the final letter. While many feminine nouns end in -a, some feminine nouns end in a consonant.

Pomoc is one of those feminine nouns. It belongs to a group of feminine nouns like:

• radost = joy
• možnost = possibility
• věc = thing

So even though pomoc does not end in -a, it is still feminine.

Je means is. It is the 3rd person singular present tense form of být = to be.

So:

• já jsem = I am
• ty jsi = you are
• on/ona/ono je = he/she/it is

In Pomoc je nutná, je links the subject pomoc with the adjective nutná, just like is in English.

Normally, no in standard Czech.

In everyday correct Czech, you usually keep je in this kind of sentence:

• Pomoc je nutná.

Leaving it out would sound incomplete, unnatural, or like a headline, note, or very compressed style.

So for normal speech and writing, use je.

It is in the nominative singular.

That is because pomoc is the subject of the sentence:

• Pomoc = the thing being talked about
• je nutná = is necessary

The adjective nutná is also in nominative singular feminine, because it agrees with pomoc.

Because Czech does not have articles like English a/an/the.

So Pomoc je nutná could mean:

• Help is necessary
• The help is necessary

The exact meaning depends on context. Very often, in a sentence like this, English naturally uses Help is necessary.

No, Czech word order is fairly flexible, but different orders can sound more or less natural depending on emphasis.

Pomoc je nutná. is a very normal, neutral sentence.

Other possible orders:

• Je nutná pomoc. = Help is needed. / Necessary is help.
• Nutná je pomoc. = It is help that is necessary. (more marked, more emphasis)

So the original version is a good basic one to learn first.

A rough pronunciation guide is:

PO-mots yeh NOOT-naa

A few useful points:

• Czech stress is usually on the first syllable of each word.
• c in pomoc is pronounced like ts.
• j in je sounds like English y in yes.
• ú/á-type long vowels are held longer; in nutná, the á is long.

So:

• pomoc ≈ PO-mots
• je ≈ yeh
• nutná ≈ NOOT-naa

Yes. A very common alternative is:

• Je potřeba pomoc.
• Pomoc je potřeba.

These also mean that help is needed, though the structure is a little different.

Still, Pomoc je nutná is perfectly correct and slightly more formal or strong in tone: it sounds like Help is necessary / essential rather than just needed.