The richly inflected morphological system of Old Iranian has been drastically reduced in Tajik. The language has no grammatical gender or articles, but person and number distinctions are maintained. Objects of transitive verbs are marked by a suffix. The latter is marked by means of prefixation. Passive is formed with the verb 'to become', and is not allowed with specified agents.
Verbs agree with the subject in person and number.
Tajik verbs are normally compounds consisting of a noun and a verb. Tajik has six vowels that can be divided into two groups, traditionally known as stable and unstable vowels. Stable vowels are always pronounced with the same length, regardless of the surrounding sounds in the word. Unstable vowels are of normal duration in some contexts, but in others they are shortened or even lost. I, little was known about Tajik.