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Section 2 Notes to difficult sentences from Unit 3 Computers1. Over time my memory has developed so much that, like an elephant, I never forget anything I have been told! 渐渐地我的记忆发展如此之大，以至于，像个大象一样，我不会忘记别人告诉我的任何事情。注意本句主句也可以改写为： my memory became so large that，like an elephant, I could never forget! 也就是变为“主-系-表结构”，即：memory的表语可以是large。Over time: As a result, nacre thickness is sometimes just a cosmetic layer that can wear thin over time. 所以真珠质的厚度就像脸上化妆品，不久就会磨薄了。2. I have been used in offices and homes since the 1970s. 从二十世纪七十年代起，我就为在办公室和家庭中为人们使用。本句谓语动词是“现在完成被动式”。现在完成时被动语态可用来强调发生在过去的被动性动作对现在造成影响。例如：This work has been finished, you may have a rest.这项工作已被完成，你可以休息一会儿。This book has been read by me, you neednt tell me anything about it.这本书已被我读完，你没有必要告诉我有关它的任何东西。现在完成时被动语态还可强调到目前为止某被动性动作或状态已存在若干时间。This film has been put on for half an hour.这场电影已放映了半个小时。3. I am now truly filled with happiness that I am a devoted friend and helper of the human race! 我现在充满了幸福感，成了人类的好朋友好帮手！注意副词truly在句中的位置。副词，如always, usually, often, sometimes, never 等，一般位于句中，有时也可以位于句首或句尾。（1）位于实义动词之前。例如：He always reads English in the morning. I often go to work at eight in the morning. I hardly ever heard him singing. （2）如果句中含有情态动词或助动词，频度副词通常放在这类动词之后，行为动词之前；如果句中有 be 动词，频度副词常常放在其后。例如：You must always read English in the morning. He has never been late. Tom is sometimes late for school. （3）当 often 前面有 very 或 quite 修饰时， often 通常置于句尾。例如：He comes to my house very often. He is late for the meeting quite often. sometimes 可置于句首，且句子不用倒装。例如：Sometimes they play football on Sundays. (=They sometimes play football on Sundays
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