of,at,for,from的用法，什么时候用？

of: [ v, v, v, f ] prep. …的,表示所属 例句与用法 1. Many of the students came from other countries. 学生中许多人来自其他国家。 2. I have heard of him. 我听说过他。 3. He is the best of teachers. 他是最好的老师。 4. I've never heard of such places. 我从未听说过这些地方。 5. My phone was out of order. 我的电话坏了。 6. Joan of Arc was made a saint in 1920. 1920年，贞德被追封为圣女。 7. I'm under a lot of pressure. 我的压力很大。 at: [ t ] prep. 在 [ 名词复数at ] 例句与用法 1. I met him at the bus stop. 我在公共汽车站遇到他的。 2. Please don't laugh at him. 请不要嘲笑他。 3. The airplane flies at 900 kilometers an hour. 飞机以每小时900公里的速度飞行。 4. I have engaged a room at this hotel. 我已经在这个旅馆里预订了一个房间。 5. There is very little profit in selling newspapers at present. 现在卖报纸利润很少。 6. I watch TV till ten at night. 我晚上看电视看到10点。 7. I'm good at it. 我做这个很在行。 8. At 20 years of age the will reigns; at 30 the wit; at 40 the judgement. 20岁我们按意愿做事；30岁我们凭智慧做事；40岁我们靠判断做事。 for: [ f:; f ] conj. 因为 prep. 给,为 例句与用法 1. He shook his head, for he thought differently. 他摇摇头，因为他的想法与此不同。 2. Are you for or against? 你是赞成还是反对？ 3. What can I do for you? 我能帮你什么忙吗? 4. He has a great respect for his father. 他很敬佩他的父亲。 5. It is for her own good. 这是为了对她自己有好处。 6. Jim is going to get material for a new book. 吉姆正打算为一部新书准备材料。 7. They jumped for joy. 他们高兴地跳了起来。 8. We have studied English for years. 我们学英语已有好几年了。 from: [ frm, frm, frm ] prep. 从,从...起 例句与用法 1. The sky slowly changed from blue to red. 天空慢慢由蓝色变为红色。 2. The train starts from Beijing. 这辆火车从北京开出。 3. From the evidence we have heard so far... 就我们所知的证据来说。。。 4. He dived from the bridge and rescued the drowning child. 他从桥上跳入水中，救起溺水的孩子。 5. Tears distilled slowly from her eyes. 泪水从她的眼睛里慢慢地滴下来。 6. Her arrest produced an immediate reaction from the press. 她被捕的事立刻在新闻界引起反应。 7. He saved his daughter from the fire but at the cost of his own life. 他牺牲了生命，把女儿从大火中救出来。 8. The dog roused a deer from the bushes. 狗惊起了丛林中的一只鹿。