英语中词类活用在构词法中被称为是词的转化。例如:Please fetch me some water .(这里的water是名词，水)Don't forget to water the flowers while I was out(这里的water是动词，浇水)Don't dream of changing a person.(这里change是动词，改变)Great changes have taken place in my hometown.(这里的change是名词，变化)。