Give them more examples to understand better, eg1I don't know what to do next2They don't know where to go3We didn't know when to startFocus on the use of the Infinitive, then give another example:It’s very important to learn English well:To learn English well is very importantLet the students make more sentences, pay attention to the use of the Infinitive

2020年nián的de干gàn花huā椒jiāo能néng卖mài多少钱一yī斤jīn干gàn花huā椒jiāo批发fā价jià格gé一yī般在zài70-80元yuán一yī斤jīn左zuǒ右，而ér零售价jià格gé可kě能néng会贵一yī点diǎn，大dà概在zài90-100元yuán一yī斤jīn左zuǒ右影响xiǎng干gàn花huā椒jiāo价jià格gé的de主要yào因素sù是shì品质zhì，品质zhì好hǎo的de干gàn花huā椒jiāo价jià格gé自zì然就会贵一yī点diǎn，比如当dāng年nián采摘的de晒干gàn的de干gàn花huā椒jiāo，香xiāng味wèi足，用yòng时口感更好hǎo，价jià格gé就会高gāo一yī点diǎn，而ér存cún放几年nián的de干gàn花huā椒jiāo，价jià格gé就会偏低一yī点diǎn

高血压患者可别以为喝了酒之后可以让血管发生扩张，这样就会让身体的血液循环增强，血压会比不喝酒的时候更低就是好事，要知道喝酒只是暂时性地让血管扩张，血压也只是暂时性的降下来，等到身体的酒精被代谢之后血压仍然会回升这个时候血管也受到了酒精的损害，久而久之，血管的硬化程度更高，肠胃、肝脏的排毒功能减弱之后导致血液里面的毒素、垃圾越来越多，就会引发动脉粥样硬化，继而发生血栓，使人出现下肢动脉栓塞、心肌梗死、脑梗死之类的严重并发症若是一个正常的人长时间地大量喝白酒，身体摄入过量的酒精之后也会导致血管发生扩张，血压反复地升高之后就会引起真正的高血压更别说本身就患有高血压的人，在喝了白酒之后，只会让身体受到更多的损害，并不会让血压恢复到正常值，所以高血压患者应该严禁喝白酒才能保证身体的健康

四、MaterialsforTeaching教具准备picturesfood(grapes,smalltomatoes,popcorns)wordcardscup,glasses,bottle,schoolbag,bowl,box五、Pre-studyDemands预习要求教师要求(Teachers)：1Preparetheteachingmaterialscarefullyfirstandthenguidethestudentstolearnthetextbythemselves学生要求(Students)：1Listenandreadthetextofunit4atleastthreetimes