Somali is an agglutinative language, using many affixes and particles to determine and alter the meaning of words. As in other related Afroasiatic languages, Somali nouns are inflected for gender, number and case, while verbs are inflected for persons, number, tenses, and moods.

Affixes change according to a number of rules. The definite article is a suffix, with the basic form being -ki or -ka for masculine nouns and -ti or -ta for feminine nouns. The k or t is the actual article marker, although it can change depending on the preceding consonant, with the following vowel determined by the case of the noun. Articles do not change for singular or plural.

Somali personal pronouns exhibit separate clitic and emphatic forms.

The clitics distinguish a subject and an object form. In the 3rd person non clitic object forms exist. If a transitive verb is used without any overtly expressed object, an object pronoun would need to be added in an English translation.

The emphatic personal pronouns behave like nouns. The emphatic forms in the table are the basic, unmarked forms (traditionally referred to as absolutive case), and, just like nouns, they all take on the ending -u instead of -a when they function as the non-focused subject of a clause. A focused subject will however be expressed by the basic form listed in the table.

Somali verbs consist of a stem to which suffixes are added. Verbs in indicative mood exist in four tenses, present, present continuous, past and past continuous, in addition to a subjunctive mood form for present and future tense. Verbs in Somali conjugate mainly through the addition of suffixes, although a very small number of common verbs use a conjugation using prefixes.

Somali has several strategies to indicate where the intention or the interest or the focus is located in the phrase: a topic-comment or focus construction. The focus particles baa, ayaa, and waxaa put the focus —and thus the emphasis— on nouns and noun phrases. Each of these focus particles can also be suffixed with the masculine and feminine clitics uu and ay. If the particle takes a clitic, it then must harmonize with it e.g. wuxuu and waxay.

Example:

1. Maxamed baa baxay – Mohamed went out
2. Sahra ayaa baxday – Sarah went out
3. Waxaa baxay Maxamed – It was Mohamed who went out

Thus, the words baa, ayaa, and waxaa unconsciously raise the question of "Who went out?", answerable by the noun.

Secondly, Somali has the particle waa, which puts the focus on verbs and verb phrases it is often contracted as wuu and way for masculine and feminine noun phrases. Also, in the example below note how the noun, focus particle, and verb are each marked for gender. This sort of abundance of gender marking is common and often obligatory in Somali.

Example:

1. Maxamed wuu baxay – Mohamed went out
2. Sahro way baxday – Sarah went out

In this case, the question would be "(Subject) did what?", this time answerable by the verb.

Also, it is not obligatory for gender clitics to be attached to the corresponding focus particle. Often they are simply placed after the particle (waxaa uu, waa ay, ayaa uu). This sort of marking is often seen in rural dialects and in literature while the combined marking (wuxuu, way, ayuu) is often seen in city dialects, although it is very common to see both regardless of location and register.

Sentences in Somali are typically of the order Subject-Object-Verb (SOV). Nouns have different tonal markings for number, gender (masculine and feminine), and case or role in the sentence.

• Somali alphabet