Speed的过去式和过去分词形式相同，均为"sped"。这个词作为名词和动词都有多种含义。作为名词，它指的是速度、快、速率、进度、加速等。例如："He reduced speed and turned sharp left." 意为"他减慢速度，然后急转左。" "The car was gathering speed." 意为"汽车正在加速。" "We aim to increase the speed of delivery." 意为"我们力争提高送货速度。" "The accident was due to excessive speed." 意为"事故是由于超速造成的。" "He drove off at high speed." 意为"他驾车高速离开。" "In the late 1850s the speed of technological change quickened." 意为"19世纪50年代末，技术变革的速度加快了。" "Speed is the essential ingredient of all athletics." 意为"速度是所有田径运动项目的关键要素。" "I was amazed at his speed of working." 意为"他工作的速度让我感到惊讶。"
作为动词，speed的意思是加速、快速前行、快速运送、促进。例如："He sped away on his bike." 意为"他骑着自行车飞快地离开了。" "The cab speeded them into the centre of the city." 意为"出租车迅速地将他们送到了市中心。" "The drugs will speed her recovery." 意为"这些药物将促进她的康复。" "The police caught him speeding." 意为"抓住了他超速行驶。" "This man was not qualified to drive and was speeding." 意为"这个人没有驾驶资格，并且超速行驶。"
通过以上内容，我们对Speed的过去式和过去分词有了更深入的了解，希望这对你有所帮助。
