practice的过去式是practised还是practiced?

practice的过去式是practised还是practiced? practice的过去式 practice的过去式 study、stay、practice、watch的过去式! play study practice 的动词过去式是什么 practice speaking English的过去式怎么变 Do you ever practice conversations with friend?这句话既然是过去式的,那这个practice不用过去式?请您解答吧,谢谢呵 practice的过去式的用法,后面是跟to还是ing?（过去式）到底是+to还是+ing啊？？？？？？？？？？？？？？？？？？？是过去式啊practiced practice过去式是什么? 求几个词的过去式relax practice stay spend watch practice、visit、stay、watch、（写出下列动词的过去式） do,play,go,study,have,listen,stop,practice的过去式 call order practice agree improve surprise 的过去式 practice过去式和过去分词 over stay practice last have cook play want need visit look的过去式 stay,make,get,practice,run,like的第三人称单数,现在分词,过去式 写出stay spend sit see say write cry study stop practice 的单三式 现在分词 过去式 SING的过去式是?sing的过去式?