句中不定式的含义为“注定,一定”。 be to do 常考的四层含义: (1)预先安排好的计划或约定; (2)表示不可避免将要发生的事情,后来注定要发生的事情; (3)表示说话人的意图、职责、义务、命令等情态意义; (4)用于条件从句,表示“如果想……;设想”。 【句型剖析】
These flowers are to die if not watered. 如果不浇水,这些花一定会枯死。 As a student, you are to concentrate your energy on your study. 作为一个学生,你应该集中精力学习。 If you are to succeed, you have to make more efforts. 如果你想成功的话,你必须更加努力。 【即时巩固】 完成句子 ①This unforgettable experience __________ (注定会影响) his growth. ②Tom as well as his colleagues ________________(打算采访) the gifted artist next Sunday. ③The assignment _________________(必须完成) in three days or you will be dismissed. 【答案】①is to influence ②is to interview ③is to be finished In any case, good management can help to make sure there is enough water to meet our basic needs. 总之,优质的管理有助于保证有足够的水来满足我们的基本需求。(2017安徽) He kept his voice lowpitched in case someone was listening. 他把声音放低以防被人听见。 【即时巩固】 用case的相关短语或句型填空 ②There is no simple answer, __________________ (这是常有的事) in science. (2017山东) ③______________ fire, ring the red alarm bell. ④You had better keep me informed of any changes of address ____________ we lose touch. ⑤__________________will I submit the case to you. 【答案】①in some cases ②as is often the case ③In case of ④in case ⑤In no case 3.demand n.需求;要求vt.强烈要求 【考点激活】 ①Get the technology that has proven to help the most ____________ customers. 获得那些已经证明最能帮助这些要求高的顾客的技术。(2015北京) (1)demand sth. 要求……;需要……
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