would与used to都可以表示过去的一种习惯，意为“过去常常做某事”，有时两者可以互换。 When we were boys，we used to/would go swimming every summer.   小时候，每到夏天我们都要去游泳。    He used to/would spend every penny he earned on books．  过去，他通常把挣来的钱全花在买书上。 人教高中英语单词mp3 人教版初中英语单词表 人教版高中英语音频 He took his son to the cinema, as a birthday treat. When we were kids, a trip to the park was a real treat. Young people should always treat the elders with respect. 注意：treat当“治疗”讲时，其名词为treatment, 表示“治疗方案” Scientific studies show that laughter produces chemicals to make people feel better, which means clown doctors can be helpful. We are specially trained clowns who work as part of a programme known as “hospital clowning”. (P2) would常用来表示过去反复发生的动作，现在这种习惯有可能还会发生。used to 常用来表示过去反复发生的动作，现在这种习惯已不复存在。 People used to believe that the earth was flat．  过去，人们总以为地球是扁平的。   He would go to the park as soon as he was free．  过去，他一有空就去公园。 The old man would sit in front of the house, waiting for his son to come to visit him. 那位老人（过去）总是坐在屋前，等儿子来看他。 I used to be able to keep two assistants, but now I only keep one. 我过去还有能力雇用两个伙计，但是现在只雇一个。 chemicals 名词，表示“化学物质”；此外，chemical还可以当形容词用，表示“化学的”，再具体语境中注意辨别。该句子中包含了which引导的非限制性定语从句，which指的是前面的整个句子。注意，当which引导非限制性定语从句时，其先行词可以是整个句子或前述的整件事。如： The old man passed away, which made all of us sad. 第二个句子中包含了一个who引导的限制性定语从句，其先行词为specially trained clowns.  限制性定语从句和非限制性定语从句的区别为：限制性定语从句起的是限制、修饰性作用，去掉后要表达的名词的意义不完整；而非限制性定语从句则是起补充说明的作用，去掉后不影响主要意义的表达。如： He has a sister who is a nurse. 他有一个当护士的妹妹。（侧重点在于当护士的妹妹，有一个，可能不止一个妹妹。） It is very ______ that she will ring me tonight. A. likely      B. possibly      C. probably        D. perhaps Your experiences are ______ to ours, but your end result is entirely different. A. same      B. different      C. similar        D. equal