1.Noun(n.):Awordthatnamesaperson,place,thing,oridea.2.Verb(v.):Awordthatshowsaction,occurrence,orstateofbeing.3.Adjective(adj.):Awordthatdescribesanounorpronoun,givingmoreinformationaboutitsquality,quantity,orstate.4.Adverb(adv.):Awordthatdescribesaverb,adjective,oranotheradverb,givingmoreinformationaboutitsmanner,time,orplace.5.Preposition(prep.):Awordthatconnectsanounorpronountoanotherwordorelementinasentence.6.Pronoun(pron.):Awordthattakestheplaceofanoun.7.Conjunction(conj.):Awordthatconnectswords,phrases,orclauses.8.TransitiveVerb(vt.):Averbthatrequiresadirectobjecttocompleteitsmeaning.9.IntransitiveVerb(vi.):Averbthatdoesnotrequireadirectobjecttocompleteitsmeaning.Extendedinformationonpartsofspeech:Nouns:1.Countablenounshaveapluralform,suchas"anapple,""twoapples,""abag,""somebags."2.Uncountablenounsdonothaveapluralform,suchas"milk,""bread,""rice."3.Somewordscanbebothcountableanduncountable,suchas"ice-cream,""salad,""chicken."Adjectives:1.Adjectivesdescribenouns,pronouns,orotheradjectives,providinginformationabouttheirqualities,quantities,orstates.2.Qualityadjectiveshavecomparativeandsuperlativeformsandcanbemodifiedby程度adverbs.Theycanserveasattributiveadjectives,predicativeadjectives,andattributivephrases.3.Descriptiveadjectives,alsoknownasattributiveadjectives,cannotbemodifiedby程度adverbsandareusuallyplacedafterthenounstheymodify.Adverbs:1.Adverbsmodifyverbs,adjectives,otheradverbs,orentiresentences,providinginformationabouttime,place,manner,ordegree.2.Whenmodifyingverbs,adverbsareplacedbeforetheverb.3.Whenmodifyingadjectivesorotheradverbs,adverbsarealsoplacedbeforethewordtheymodify.4.Whenmodifyinganentiresentence,adverbscanbeplacedatthebeginningofthesentence,separatedbyacomma.Theseadverbsoftenexpressdegreeormanner.详情