speed的过去试和过去分词. sped or speeded，sped or speeded2种用法都可以 英美习惯而已
什么时候用一般过去试\\过去分词 一般过去时：主语的动作发生在过去.换句话说，就是句子里通常要有明确的过去时的时间状语，比如，last year，at 10：00 this morning，in 1988，10 years ago等等.过去分词：首先用于完成时态，如现在完成时、过去完成时、将来完成时等；比如：I have waited for you for one and a half hours.(waited过去分词)By the end of next year，I'll have learnt 500 new words.(learnt过去分词)When my mom came home，I had finished my homework.(finished过去分词)其次，用于被动语态.比如：The tables have been cleaned by the waitresses.另外，过去粉刺还有许多其它用法，比如作为定语修饰名词或代词；作为状语修饰动作等等.在此不再多说.
求。英语，过去式和过去分词。 bet fit set shut spit spread d求。英语，过去式和过去分词。 bet fit set shut spit spread deal dream lead light retell rebuild speed spell stick shall overeat
