Unit 1 Life Choices Section 4 Focus on Language：Infinitives 课件（共62张）+学案（含答案）+练习（含答案）

Section 4　 Focus on Language：Infinitives 课时目标 1.辨析句子中的谓语动词与非谓语动词。 2.分析并识别非谓语动词在句子中充当的成分。 3.能正确识别动词不定式在句中的成分并准确使用。 语境中体悟　 Are you looking for a sports watch to help you keep track of your fitness and chart your training progress① To wear a DX Sports Watch② is an ideal choice for you, whether you're a professional athlete or keen sportsperson.It has a digital display to record your steps, speed and distance③ , as well as monitor your heart rate and calories burnt.It also has a voice control setting to enable you④to stay hands free⑤， while its waterproof band is fully adjustable so that it is comfortable to wear⑥. DX Sports Watch is only available online, so go to our website and place your order today! [语法入门] 句①动词不定式to help you keep ...作后置定语，修饰a sports watch。 句②动词不定式To wear ...作主语。 句③动词不定式to record your steps ...作后置定语，修饰a digital display。 句④动词不定式to enable ...作后置定语，修饰 a voice control setting。 句⑤动词不定式to stay hands free作宾语补足语。 句⑥动词不定式 to wear作状语。 学案中理清　 动词不定式是非谓语动词的一种，它没有人称和数的变化。动词不定式具有名词、形容词和副词的特征，在句中可以作主语、宾语、表语、定语、状语、宾语补足语等，但不能作谓语。其基本结构：to＋动词原形，有时不定式符号to可以省略。其进行时为to be doing，完成时为to have done，否定式为not to do。 一、动词不定式作主语、宾语和表语　 [先感知] ①(教材典句)It's so convenient to be able to compare the quality and prices from different online shops before I buy. ②(教材典句)My aim is to do well in every subject this term. ③(教材典句)All in all, I hope to have a happier, more fruitful and satisfying life in my new school. ④To do this is to cut the foot to fit the shoe. ⑤I think it very necessary to protect the animals. ⑥(教材典句)．..my target is to prepare myself for my degree in biology at university. [会发现] 上述几个例句，其中_____句是不定式短语作主语，_____句是不定式短语作表语，_____句是不定式短语作宾语。(填句子序号) [明规则] 1．动词不定式作主语 (1)动词不定式作主语时，表示具体的行为或将来的行为，谓语动词用单数。 As the saying goes, “To see is to believe.” 正如谚语所说：“眼见为实。” (2)为了避免头重脚轻，常用it作形式主语放在句首，将不定式置于句末。 It took me half an hour to work out the difficult math problem. 我花了半个小时才解出这道数学难题。 |名师点津| (1)若要说明不定式表示的动作的发出者，要在不定式前加for或of引起的短语，构成“for/of＋名词(或代词宾格)＋不定式”结构，这一结构被称为不定式的复合结构。 (2)在“It is/was＋adj.＋不定式复合结构”句型中，当其中的形容词是说明逻辑主语的性质、品质时，要由of引出逻辑主语，不能用for。这类形容词主要有clever、friendly、careless、foolish、kind、nice、polite、silly、stupid、wise等。 It is important for him to attend every day. 他每天都要出席，这很重要。 It is kind of you to help me with my English. 你帮我学英语真是太好了。 2．动词不定式作宾语 (1)有些动词后常跟不定式(而不跟动名词)作宾语，如： decide、 afford、 agre ... ...