will buy 肯定会买，已经决定要买了，还没有购买 want to buy 想要买，只是一个想买的意愿举例一：I will buy one simply to end the ceaseless negotiations over screen time with my daughter.为了不再为屏幕时间与女儿进行无休止的'谈判'，我肯定会买一台。
举例二：And it will buy an additional one hundred billion dollars of stock in each company.另外，政府将会在这两个公司各买1000亿美元的股票。
举例三：You want to buy my land with one dollar? Over my dead body.你想用一美元买我的地，做梦！
举例四：I want to buy a house. I need to apply for the mortgage.我想买一栋房子。我想申请贷款。
