云南省德宏州梁河县第一中学高中英语 unit4 using language教学课件 新人教版必修2.ppt

readingii whatarethey dinosaurs milu dodos guess whatthereasonsmightbefortheirdisappearance usinglanguage reading 1 whendiddinosaurslive tensofmillionsofyearsago 2 whendiddinosaursdieout about65millionyearsago 3 howdiddinosaursdieout alargerockhittheearthandputtoomuchdustintotheair theearthgottoohottoliveon tensofmillionsofyearsago longbeforehumanscameintobeing abird likedinosaurwhichcouldnotonlyrunbutalsoclimbtrees maybethat sbecausealargerockhittheearthorbecausetheearthgottoohottoliveon detailedreading 1 theylivedontheearthtensofmillionsofyearsago longbeforehumanscameintobeingandtheirfutureseemedsecureatthattime 点拨1 本句是一个由and连接的并列句 其中 longbefore引导时间状语从句 进一步解释说明tensofmillionsofyearsago 意为 在 之前很久 注意 beforelong意为 不久以后 languagepoints 点拨2 ontheearth 在地球上 在earth sun moon等表达世界上独一无二的名词前 要加the 点拨3 comeintobeing的意思是 开始存在 发生 l例 it longbeforewe theresultoftheexperiment a willnotbe willknowb is willknowc willnotbe knowd is know 拓展 beforelong不久以后 2 whenscientistsinspectedthebones theyweresurprisedtofindthatthesedinosaurscouldnotonlyrunliketheothersbutalsoclimbtrees 点拨 本句中的tofindthat 是不定式作原因状语 不定式用来表原因时 常修饰表示情感 心理状态 性格等的形容词 如 3 somescientiststhinkitcameafteranunexpectedincidentwhenahugerockfromspacehittheearthandputtoomuchdustintotheair 点拨 本句中when引导定语从句 其先行词为incident 关系副词when的先行词一般是表时间的名词 如 hecamelastnightwheniwasout 但有时并不直接是表时间的名词 如 4 accordingtoaunreport accordingto根据 据 说ac