Hittite lacks some features of the other Indo-European languages, such as a distinction between masculine and feminine grammatical gender, subjunctive and optative moods, and aspect. Various hypotheses have been formulated to explain these contrasts.
Some linguists, most notably Edgar H. Sturtevant and Warren Cowgill, have argued that it should be classified as a sister language to Proto-Indo-European, rather than a daughter language, formulating the Indo-Hittite hypothesis. The parent, Indo-Hittite, lacked the features not present in Hittite, which Proto-Indo-European innovated.
Other linguists, however, have taken the opposite point of view, the Schwund ("loss") Hypothesis, that Hittite (or Anatolian) came from a Proto-Indo-European possessing the full range of features, but simplified. A third hypothesis, supported by Calvert Watkins and others, viewed the major families as all coming from Proto-Indo-European directly. They were all sister languages or language groups. Differences might be explained as dialectical.
According to Craig Melchert, the current tendency is to suppose that Proto-Indo-European evolved, and that the "prehistoric speakers" of Anatolian became isolated "from the rest of the PIE speech community, so as not to share in some common innovations."Hittite, as well as its Anatolian cousins, split off from Proto-Indo-European at an early stage, thereby preserving archaisms that were later lost in the other Indo-European languages.
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