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1、LanguageIfsentencesIf引导的条件状语从句Ifyoucoolwater,itturnsintoice.①②ifclause从句mainclause主句Ifsentencesif引导的条件状语从句1.Ifyouheatmetal,itmelts.如果把金属加热，它就会融化。2.Waterturnsintoiceifyoucoolit.如果你冷却水，它就会变成冰。ifclause从句mainclause主句从句主句从句主句从句在主句前时，____（用/不用）逗号隔开当主句在前时，则____（用/不用）逗
2、号不用用Ifyoudropaglass,itbreaks.Ifyouheatice,itmelts.Ifyoustandintherain,yougetwet.主句和从句都用_____________(时态)因为if引导的条件句说的是_____________一般现在时客观事实/普遍现象Actionswithdefiniteresults读下列例句，试着自己总结if的用法：1.Ifyouheatmetal,itmelts.如果把金属加热，它就会融化。2.Waterturnsintoiceifyoucoolit.如果你
3、冷却水，它就会变成冰。3.Ifyoustandintherain,yougetwet.如果你站在雨里，就会淋湿。4.Ifyoudropaglass,itbreaks.如果你把玻璃杯掉在地上，它就会碎。由例句我们可以知道：如果if引导的条件句谈论的是一种____________时，主句谓语动词便不用shall/will+动词原形，而直接用_______时的动词形式。真理/客观事实一般现在ActionswithDefiniteResultsWater________(turn)intoiceifyou__________
4、(cool)it.Ifyou________(stand)intherain,you_________(get)wet.turnscoolstandget--b--d--g--a--h--c--f--eExerciseA11.Ifyou___________________water.2.Aballoon_____________________it.3.Ifyou___________________water.4.Metal_____________________it.5.Wood_______________
5、__water.6.Aglass_________________it.heatice,itturnsintoburstsifyoustickapinintocoolsteam,itturnsintomeltsifyouheatfloatsifyouputitintobreaksifyoudropExerciseA2Actionswithpossibleresults读下列例句，总结if的用法：1.Ifheruns,he’llgetthereintime.如果他跑步去，就会及时赶到那。2.Hewillhelpyoui
6、fyouaskhim.如果你请他帮忙，他会帮你的。3.Ifyoufailintheexam,youwilllethimdown.如果你考试失败了，你会让他失望的4.Ifyougetuplate,youwillbelateforschool.如果你起床晚了，上课就会迟到。由例句我们可以知道：在if引导的条件状语从句中，如果从句谈论的是一个有可能发生的事实以其产生的相关结果，从句用_____________,主句用_______________.一般现在时态一般将来时态(主将从现)I________(stay)athom
7、eifit_______(rain)tomorrow.Ifhe____________(notcome),I_____________(go)swimmingalone.willstayrainsdoesn’tcomewillgoActionswithPossibleResultsIfyougetuplate,youwillbelateforschool.LookandsaygetuplatelateforschoolIfthetelephonerings,Iwillanswerit.Lookandsayringan
8、swerIfIhavealotofmoney,Iwillbuyabighouse.Lookandsayalotofmoneyabighousehard-workingIfsheishard-working,shewillgetgoodgrades.getgoodgradesLookandsaygofishing.IfitissunnythisS
