Unit 1 Period Two Part Ⅱ Grammar—Infinitives（Word教参） -【状元桥·优质课堂】2021-2022学年新教材高中英语必修第一册（北师大版）

Part Ⅱ　Grammar—Infinitives 感知以下课文原句，完成方框下的小题 1．It's so convenient to be able to compare the quality and prices from different online shops before I buy. 2．My mum keeps telling me to go out with my school friends instead. 3．Actually, I do know I need to drag myself away from the online world sometimes… 4．I like to set goals for myself. 5．I'm a “go­getter”—when I set out to do something, I do my best to achieve it. 6．I tend to set a goal for every subject at the beginning of each term. 7．My aim is to do well in every subject this term. 8．Biology is my favourite subject, and my target is to prepare myself for my degree in biology at university. 9．…so that I can have more free time to do other things that I'm interested in after school. 10．It always makes me excited to work hard and achieve a team goal together. 11．To achieve all I want, I must use my time well. 12．After school, I try to use any possible time to revise the things I have learnt during the day. 13．For example, it usually takes me 20 minutes to get home by bus. 动词不定式(短语)在句中可作主语，如句__1__、句__10__和句__13__；可作宾语，如句__3__，句__4__，句__6__和句__12__；可作表语，如句__7__和句__8__；可作定语，如句__9__；可作宾补，如句__2__；可作状语，如句__5__和句__11__。 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。 一、结构 基本结构：to＋动词原形，有时不定式符号to可以省略。 否定形式：not to＋动词原形。 不定式有形式和语态变化，通常有下表中的几种形式(以do为例)： 形　式 主　动 被　动 一般式 to do to be done 完成式 to have done to have been done 进行式 to be doing 完成进行式 to have been doing 二、用法 1．作主语 动词不定式作主语时，表示具体的或将来的行为，谓语动词用单数。 ►To love and to be loved is the greatest happiness one can seek.爱与被爱是一个人所能寻找的最大幸福。 为了避免头重脚轻，常用it作形式主语放在句首，作主语的不定式常置于句末。 ►It would be better for you to go there.你最好去那里。 [温馨提示](1)若要说明不定式表示的动作的发出者的话，要在不定式前加for引起的短语，构成“for＋名词(或代词宾格)＋不定式”短语，这一短语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, careless, foolish, kind, nice, polite, silly, stupid, wise等。 ►It's easy for him to work out this math problem. 对他来说解出这道数学题很容易。 ►It was careless