1.spend一词的主语通常是人。直接宾语可为金钱和时间,常用句型:(1)spend time/money on sth.(2)spend time/money(in)doing sth.例如:I spend two hours on the homework.我花了两个钟头做家庭作业。She spent half of her money on clothes.她花了一半的钱买衣服。He spent four years(in)writing the book.他花了四年时间写这本书。2.cost一词的主语只能是物、事或it。 The subject of the word 1.spend is usually human. Direct object can be money and time, common sentence types: (1)spend time/money on sth.(2)spend time/money(in)doing sth. For example:I spend two hours on the homework.I spent two Hours to do homework. She spent half of her money on clothes. She spent half her money on clothes. He spent four years (in)writing the book. He spent four years writing this book. The subject of 2.cost can only be matter, thing or it.