Þau munu tala íslensku saman í kvöld.

Þau is the 3rd-person plural neuter pronoun (they). Icelandic uses:

• þeir = they (masculine plural)
• þær = they (feminine plural)
• þau = they (neuter plural) and very commonly for a mixed-gender group, or when you’re talking about children/young people as a group, or an unspecified group. So Þau doesn’t mean the people are “neuter” in English terms; it’s often the default for “they” when the group isn’t all-male or all-female.

munu is a present-tense form of the verb munu used as a future/likely future auxiliary:

• Þau munu tala = they will / they are going to speak Structure: munu + infinitive (here, tala). It often suggests a prediction/expectation (“will probably/are expected to”), but in many contexts it’s just a neutral “will.”

Yes. Very often Icelandic uses the present tense with a time expression:

• Þau tala íslensku í kvöld. = They speak/Icelandic tonight → “They’re speaking Icelandic tonight.” You can also use ætla að (intend to):
• Þau ætla að tala íslensku í kvöld. = They intend/plan to speak Icelandic tonight. So munu is just one common way to express future meaning.

Because after the auxiliary munu, Icelandic uses the infinitive:

• munu tala (will speak) So tala is the infinitive “to speak.”

In Icelandic, names of languages and nationalities are usually not capitalized unless they start a sentence:

• íslenska (Icelandic language)
• ensk(a) (English) So íslensku is correctly lowercase here.

Because tala takes the language as an object, and the language name íslenska declines like a noun/adjective. Here it’s in the accusative singular:

• nominative: íslenska
• accusative: íslensku
• dative: íslensku
• genitive: íslensku So tala íslensku = “speak Icelandic.”

saman means together. It’s an adverb and is fairly flexible:

• Þau munu tala íslensku saman í kvöld.
• Þau munu tala saman íslensku í kvöld. Both are possible; placement is often about emphasis and rhythm. Putting saman after the object (íslensku) is very common.

í kvöld means tonight. With time expressions, í typically governs the accusative (duration/when):

• kvöld is neuter; nominative/accusative singular are the same form: kvöld So you don’t see a change in form here even though it’s accusative.

This sentence is in straightforward main-clause order:

• Subject: Þau
• Auxiliary verb (2nd position): munu
• Infinitive: tala
• Object: íslensku
• Adverb: saman
• Time phrase: í kvöld So it follows the common Icelandic main-clause pattern where the finite verb (munu) comes early.

A practical guide (approximate):

• Þau: th (as in thin) + oy/öy-like diphthong → roughly “thoy” (varies by speaker)
• íslensku: stress on the first syllable: EES-len-sku (with a clear í = long “ee”)
• kvöld: the ö is like German ö / French eu; roughly “kvœld” (and ld is pronounced together, not as two separate syllables)