Unit1語法專項課件 if because狀語從句

教學課件外研英語九年級上冊Unit1語法專項——if&because狀語從句

全解精講+分層練習1.分清because原因狀語從句、if條件狀語從句用法2.掌握because兩大句式與時態統一規則3.牢記if從句核心考點：主將從現4.區分because與so、because和becauseof的區別學習目標語法導入——狀語從句概念

狀語從句：用完整句子修飾主句，表原因、條件等

本節課兩類從句：原因、條件狀語從句

because引導原因，解釋事情發生的緣由

if引導條件，描述假設帶來的未來結果because引導原因狀語從句?含義because意為“因為”，從句說明原因，主句表結果語序一：主句在前+because+從句

例句：Ilikepaper-cuttingbecauseit’sChineseart.語序二：Because從句放句首，加逗號再接主句

例句：Becauseit’straditional,weshouldprotectit.because從句時態規則主從句時態必須保持一致，無特殊變化一般現在時：描述常態、客觀事實

Helearnspuppetrybecausehelovesfolkculture.一般過去時：描述過去發生的事

Shestayedhomebecauseshewasbusyyesterday.because核心禁忌1：不能和so連用because表原因，so表結果，二者二選一，不可同句

錯誤：Becauseartsaredying,soweprotectthem.

正確1：Artsaredying,soweprotectthem.

正確2：Weprotectartsbecausetheyaredying.because核心禁忌2：回答why只用becausewhy用來提問原因，答句必須使用because

—Whydoyoujointheartclub?

—IjoinitbecauseIwanttolearnshadowpuppets.

不能用if、so回答why問句易混辨析：becausevsbecauseofbecause+完整句子（主謂齊全）becauseof+名詞、名詞短語、動名詞

例句1：Ilovepuppetsbecausetheyarebeautiful.

例句2：Ilovepuppetsbecauseoftheirbeauty.if引導條件狀語從句?基礎含義

if翻譯為“如果”，提出假設條件

滿足從句條件，主句就會出現對應結果

兩大基礎語序，逗號使用有區分

核心黃金規則：主將從現（重中之重）主將從現講解if從句（條件）：一律用一般現在時主句（結果）：用一般將來時will+動詞原形結構1：If+現在時，主句將來時（加逗號）

Ifyoupractice,youwillcutnicepaperworks.結構2：主句將來時if+現在時（無逗號）if從句主語三單變形規則從句主語是he/she/it/單數名詞，動詞變三單

Ifhelearnspuppetry,hewillspreadthisart.

learn→learns，末尾加s

對比：Iftheylearnpuppetry,theywillspreadit.if引導否定條件句從句否定：主語+don’t/doesn’t+動詞原形

Ifwedon’tprotectarts,wewilllosethem.主句否定：willnot=won’t+動詞原形

Ifshedoesn’tjointheclub,shewon’tlearncutting.if一詞兩種含義拓展區分條件狀語從句：if=如果，遵循主將從現賓語從句：if=是否，時態跟隨主句變化

例句1（條件）：Ifyoucome,Iwillshowpuppets.

例句2（賓語）：Idon’tknowifhewillcome.because與if從句對比表格引導詞作用時態規則標志性考點because說明原因主從句時態統一不與

so連用，回答whyif提出假設條件主將從現從句用一般現在時解題步驟1選詞填空判斷邏輯1.先判斷前后句邏輯：因果用because2.前后為假設條件關系，選用if3.句首If首字母必須大寫4.因果句可提取關鍵詞why、busy、reason5.條件句可提取will、soon、next等將來標志解題步驟2兩句合并為because復合句1.找出表結果的句子作主句，表原因作從句2.主句在前直接加because連接從句3.從句放句首，末尾加逗號隔開主句4.統一主從句時態，不能出現時態沖突5.不可同時添加so，刪掉多余連詞解題步驟3兩句合并為if條件句1.找出表假設的句子作if從句2.從句改為一般現在時，去掉will3.結果句作主句，保留will+動詞原形4.從句前置加逗號，后置不用逗號5.注意三單、否定don’t/doesn’t變形易錯點1主將從現時態顛倒

錯誤：Ifyouwillpractice,youmakegoodworks.

錯誤原因：從句不能使用將來時will

改正：Ifyoupractice,youwillmakegoodworks.

口訣：if從句永遠現，主句將來will現易錯點2because與so疊加使用

錯誤：BecauseIlikeart,soIjointheclub.

修正方案二選一：刪because或刪so

正確：Ilikeart,soIjointheclub.

正確：IjointheclubbecauseIlikeart.易錯點3becauseof后接完整句子1.錯誤：Iloveartbecauseofithaslonghistory.2.becauseof后只能接名詞短語，不能接句子3.改正：Iloveartbecauseithaslonghistory.4.有主謂完整句子，統一用because易錯點4過去時態不統一1.錯誤：Hemissedtheshowbecauseheisbusy.2.主句didn’t為過去式，從句同步用was3.改正：Hemissedtheshowbecausehewasbusy.4.看到過去時間詞，前后時態全部變過去題型一if/because選詞填空

1.Wesavepaper-cutting__________itispreciousculture.2._______wekeeppracticing,wewillmasterpuppetry.3.Sherecordspuppetshows_______shewantstosharethem.4._______youignoreoldarts,theywilldisappearslowly.5.Ididn’ttakepartintheactivity_______Iwasill.becauseIfbecauseIfbecause6.Folkartsattractteenagers_______theyarefullofbeauty.7.Thepuppetlooksvivid_______youcontrolitskillfully.8.Manyelderslovepaper-cutting_______theygrewupwithit.9._______morestudentslearntraditionalskills,theywon’tdisappear.10.Werespectfolkartists_______theycarryonoldculture.becauseifbecauseIfbecause題型二單項選擇題

1.—Whydoyoulearnshadowpuppets?—_______theycarrythousandsofyearsofhistory.A.IfB.BecauseC.So2.Ifyou_______hard,you_______makeperfectpaper-cuts.A.work;willB.willwork;doC.work;do3.Weshouldprotectoldcrafts,_______theyaredisappearing.A.ifB.becauseC.so4._______yourefusetolearnfolkarts,you_______losetraditionalknowledge.A.If;won’tB.If;willC.Because;will5.Becauseshelovesculture,_______shelearnspuppetry.A.soB./C.butBABBB6.Heskippedthefolkshowyesterday_______hehadatest.A.ifB.becauseC.when7.People_______spreadpaper-cuttingifthey_______schoolactivities.A.willhelp;holdB.help;holdC.willhelp;willhold8.Theoldcraftcanstayalive_______youngpeopletakeitup.A.becauseB.ifC.though9.Iadmirefolkartists_______theysticktotraditionalskills.A.ifB.soC.because

10.Ifhe_______free,he_______watchthepuppetperformance.A.is;willB.willbe;willC.is;doesBABCA題型三句型合并改寫

1.Shelovesshadowpuppets.Theyshowoldstories.（用because合并）2.Youlearnpaper-cutting.YouwillknowChineseculture.（if從句前置）3.Traditionalartsareindanger.Weneedtoprotectthem.（分別用because、so寫兩句）4.Ifyoupracticedaily,youwillbeskilled.（改寫，從句放句末）Ifyoulearnpaper-cutting,youwillknowChineseculture.①Weneedtoprotectthembecausetraditionalartsareindanger.②Traditionalartsareindanger,soweneedtoprotectthem.YouwillknowChinesecultureifyoupracticedaily.Shelovesshadowpuppetsbecausetheyshowoldstories.題型四句子改錯

1.Becausemanyfolkartsdisappear,soweshouldprotectthem.2.Ifshewillpracticemore,shelearnspaper-cuttingwell.3.Ienjoypuppets