spend的用法:sb. spend 一段时间 (in) doing sth.
sb. spend 钱 on sth.
例如: l spend an hour (in) reading a book.
l spend ten yuan on this book.
pay的用法:sb.pay 钱 for sth.
例如:l pay ten yuan for this book.
take的用法:lt takes sb. some time to do sth.
例如:lt takes me an hour to go to school.