Fromchildhoodtooldage, wealluselanguageasameansofbroadeningourknowledgeofourselvesandtheworldaboutus.Whenhumansfirst __1__ , theywerelikenewbornchildren, unabletousethis __2__ tool.Yetoncelanguagedeveloped, thepossibilitiesforhumankindsfuture __3__ andculturalgrowthincreased. Manylinguistsbelievethatevolutionis __4__ forourabilitytoproduceanduselanguage.They __5__ thatourhighlyevolvedbrainprovidesus __6__ aninnatelanguageabilitynotfoundinlower __7__ . Proponentsofthisinnatenesstheorysaythatour __8__ forlanguageisinborn, butthatlanguageitselfdevelopsgradually, __9__ afunctionofthegrowthofthebrainduringchildhood.Thereforetherearecritical __10__ timesforlanguagedevelopment. Current __11__ ofinnatenesstheoryaremixed, however, evidencesupportingtheexistenceofsomeinnateabilitiesisundeniable. __12__ , moreandmoreschoolsarediscoveringthatforeignlanguagesarebesttaughtin __13__ grades.Youngchildrenoftencanlearnseverallanguagesbybeing __14__ tothem, whileadultshaveamuchhardertimelearninganotherlanguageoncethe __15__ oftheirfirstlanguagehavebecomefirmlyfixed. __16__someaspectsoflanguageareundeniablyinnate, languagedoesnotdevelopautomaticallyinavacuum.Childrenwhohavebeen __17__ fromotherhumanbeingsdonotpossesslanguage.Thisdemonstratesthat __18__ withotherhumanbeingsisnecessaryforproperlanguagedevelopment.Somelinguistsbelievethatthisisevenmorebasictohumanlanguage __19__ thananyinnatecapacities. Thesetheoristsviewlanguageasimitative, learnedbehavior. __20__ , childrenlearnlanguagefromtheirparentsbyimitatingthem.Parentsgraduallyshapetheirchildslanguageskillsbypositivelyreinforcingpreciseimitationsandnegativelyreinforcingimpreciseones.
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