I spend 10yuan on magazine every week 同义句Magazine—— ——10 yuan every week

I spend 10yuan on magazine every week 同义句Magazine—— ——10 yuan every week I spend ten yuan on the picture的同义句 I spend 50 yuan on this chair.改为同义句. I spend 100 yuan on the coat .同义句转换i__100 yuan __the coat 划线提问I spend 15 yuan on this book.划线部分15 yuan I spend ten yuan on this book请问这里的on怎么解释? I spend ten yuan on this book 和 I spend ten yuan for this book 后者是对的吗?为什么? I spend two yuan on this books.(用cost转换同义句) I will spend 50 Yuan on a watch(同义句) =I will （ ）50 Yuan （） a watch =I will 50 yuan （）（）=It（） take me 50 Yuan （）（）a wacth 改同义句,两题.1.I spend five yuan on this pen 2.I can't find my pen The book cost me 20 yuan (改为同义句)I ____20yuan_____the book.为什么是spend on而不是pay for? I spend five yuan on the book改为同义句I_five yuan_the book,这两个词用法的区别是什么 The book cost me 20 yuan (改为同义句)I ____20yuan_____the book.为什么是spend on而不是pay for? 句型转换：I spend ten yuan on this book.this book cost me ten yuan .答案中的cost为什么不加s,会的来 I spend fifty yuan on this year's Christmas card.(同义句改写)this year's Christmas cards ____ ______ fifty yuan She paid 10yuan for this book她花了10元购这本书I spend 10yuan on this book这本书我花了10元这两句话是一样的意思对吧?一个强调pay 一个强调spend?为什么句中一个用for和on?是固定的吗? I paid 1,500 yuan for the mobile phone.同意句:I _________ 1,500 yuan ____________the mobile phone.答案上是spend ; on 为什么不可以用spend ; buying? You should spend ten yuan on these newspapers 同义句