she sprinkled some pepper on the noodles just now
Some pepper was sprinkled on the noodles by her just now
My mother asked me to water the flowers every day
I was asked by my mother to water the flowers every day
把主动语态的【宾语】变成【被动语态】的【主语】,过去时态的被动语态的构成：
单数主语+was+过去分词+其他
复数名词+were+过去分词+其他