pay表示付钱,如I pay 10 yuan for this book.spend花费时间/金钱/精力等,I spent 2 hours in reading the book.She in spent 100 yuan on the ticket.He spent his whole life on research.*pay/spend的主语均为人 take表示做某事需花费多少时间/金钱,如It takes you 10 minutes to walk from here to there.cost的用法和take非常相似,This book costs 10 yuan.*take/cost的主语为物 *spend sth in doing...in可以省略