Old Norse often provided direct alternatives or synonyms for Anglo-Saxon words, both of which have been carried on (e.g. Anglo-Saxon craft and Norse skill, wish and want, dike and ditch, sick and ill, whole and hale, raise and rear, wrath and anger, hide and skin, etc). Unusually for language development, English also adopted some Norse grammatical forms, such as the pronouns they, them and their, although these words did not enter the dialects of London and southern England until as late as the 15th Century. Under the influence of the Danes, Anglo-Saxon word endings and inflections started to fall away during the time of the Danelaw, and prepositions like to, with, by, etc became more important to make meanings clear, although many inflections continued into Middle English, particularly in the south and west (the areas furthest from Viking influence)