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Warm-upLet’schantoUnit4Whenistheartshow?PartALet'sspellHeismyfriend.What’shelike?Heistallandthin.Heisthirteen.Howoldishe?Heisthirteen.Helikesthree.Helikesthree.Helikesmaths.咬舌/s/音irthirteenteenmathsamthsthininrthreeeethththth读清辅音/θ/咬舌/s/的音thirteenmathsthreethinthirdfifththicktoothbirthdaybirthdayIt’smybrother’sbirthday.Thisismybrother.Thatismyfather.Thisismymother.athattmotheromtherfatheratherithissfthththatmotherfatherthisth读浊辅音/ð/咬舌/z/的音thesethoseclothestherethisfifththirdbrothermotherOh,Ifindmyhome!threefatherthatthesethirteenthinmouth1．字母组合th在数词（包括基数词和序数词）中读清辅音/θ/。(咬舌/s/音)例：three/θri:/，third/θә:d/，thirteen,thirty2.以th结尾的单词，th读清辅音/θ/。(咬舌/s/音)例：mouthtoothmathsmonth3.th在代词中读浊辅音/ð/。(咬舌/z/音)例：thisthatthesethosetheretheir4．在th后以字母-er结尾的单词中，th读浊辅音/ð/。(咬舌/z/音)例：father/'fa:ðә/，motherbrotherwhetherweather/'weðә/Thatisherfather.HismotherisaChineseteacher.Tonguetwist1.Threethinbrothersarebathinginthebathroom.2.Theirfatherandmotherthinkit’sgoodforthemtobrushtheirthickteethonThursday.3.Afterbathing,theywillwalkthroughapath.4.Look!Theweatherisratherfine.Thankgoodness!Thankyou