高二英语教案：高二英语下册Unit13复习教案(12)
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(4) 如果前面提到的名词是复数形式，为避免重复，则可视具体情况分别用they，them，ones或those代替。例如：① -- What's in these cups? 什么在这些杯子里? -- There's some tea in them. (them 代替cups)有些茶。② He thought it over carefully and concluded that heavy objects always fell faster than light ones. (ones代替objects) 他仔细考虑并且推断出重的物体比轻的物体落得快。③ Those weren't the right men, professor. (those代替men) 那些人不合适，教授。 (5) it和that可代替前面整个句子的意思, 而one却不能。例如：① -- We'll try our best to catch them. 我们将尽最大努力赶上他们。-- It's not necessary, inspector.不必要，检察官。②Dr Brown said they had talked about my invention．But that was not possible. 布朗博士说他们谈过我的发明，但那是不可能的。 ▲ 注意：间或it可以先出现，用以代替后面分句中的某一名词或整个分句的意思，而that和one则不能。 (6) that可引导一个限制性定语从句，代替某个先行词(单复数名词均可)，it和one则不能。例如：① A plane is a machine that can fly. (that指代先行词machine). 飞机是能飞的机器。② The students that don't study hard will no pass the examination. (that指代students)不努力学习的学生不会通过考试。 (7) it可以代替不定式、动名词或从句，用作形式主语或形式宾语，而one和that则不能。例如：① It is a great pleasure to see you again. (it代替to see you again)见到你真高兴。② It is no use calling him up. (it代替calling him up) 给他打电话是没用的。③ We found it impossible that they would finis the work in two days. (it代替that they would finish the work in two days) 我发现两天后完成工作是不可能的。 25. Tides provide energy for the ecosystems, but estua- ries are protected from waves and storms by islands, mud or sand. 海潮为生态系统提供能量，河口则由于受到岛屿和泥沙的保护而免遭海浪和风暴的影响。(p.23 第二段 第3－4行) 1) 动词provide的用法 ▲provide意为“提供”“借给”，通常用"provide sb. with sth."或"provide sth. to／for sb."这两个结构，意为“向某人提供某物”。如：①The book will provide you with the information you need. 这本书会向你提供你所需的情况。 ② We provided him with lodging and food.我们向他们提供食宿。③ The sick were provided with blankets against cold. 给这些病人提供了御寒的毯子。④ His uncle provides money to John. 约翰的伯父给他钱。⑤ The forests provide shelter for wild animals.森林为野兽提供藏身之处。 【注】provide与against连用。如： ① They had already provided against the attack. 他们已做好应付进攻的准备。 ② We have to provide against accidents. 我们必须做好应付事故的准备。 【注】provide的过去分词可引导条件状语从句，表示“如果”“只要”。如：① You may keep the book a further week provided that no one else requires it. 只要没有别人要这本书，你还可借一个星期。② She may come with us provided (that) she arrives in time.如果她及时到达，她可能会和我们一道来。③We'll visit Europe next year, provided we have the money. 如果我们有这笔钱，我们明年将去欧洲。 (责任编辑：admin) |
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