Section Ⅳ Discovering Useful Structures——动词－ing 形式(1)动词-ing 形式(现在分词)由“动词原形＋-ing”构成，在句子中可以作主语、定语、表语、宾语补足语和状语。一、动词－ing 形式作定语[合作探究 1]We are not allowed to speak aloud in the reading room.在阅览室里我们不准大声说话。There is a swimming pool in our school.我们学校有一个游泳池。[自主发现 1] 动词－ing 形式作定语表示所修饰名词的属性、作用或用途。[合作探究 2]The boy studying (＝who is studying) in the classroom is our monitor.在教室学习的那个男孩是我们的班长。[自主发现 2] 动词－ing 形式作定语表示所修饰名词的动作或状态，相当于一个定语从句。[合作探究 3]We’ll have an exam in the coming week.下周我们将进行一次考试。They lived in a house facing south (＝which faces south)．他们住在一所朝南的房子里。Do you know the boy playing basketball (＝who is playing basketball)?你认识在打篮球的那个男孩吗？[自主发现 3] 当动词－ing 形式单独作定语时，放在所修饰的名词前；如果是动词－ing短语作定语，则放在该名词后。二、动词－ing 形式作表语[合作探究 1]Her job is keeping the lecture hall as clean as possible.(＝Keeping the lecture hall as clean as possible is her job.)她的工作是尽量使报告厅保持干净。Her duty is taking care of the babies.(＝Taking care of the babies is her duty.)照看婴儿是她的职责。[自主发现 1] 动词－ing 形式表示主语的内容时，可以转换到句首作主语。[合作探究 2]The problem is quite puzzling.这个问题很令人困惑。The film we saw last night was very moving.我们昨晚看的那部电影非常感人。[自主发现 2] 动词－ing 形式表示主语的某种性质和特征时，通常可以看作形容词。常用来作表语的现在分词有astonishing，amusing，confusing，disappointing，boring，encouraging，inspiring，moving，tiring，interesting，surprising 等。[名师提醒](1)作表语时，系动词除be外还有appear，sound，look，become，come，get，go，grow，keep，remain，seem 等。(2)动词－ing 形式作表语用时，相当于形容词，表示性质或状态；而进行时态中的动词－...
