改错：.If you pay more attention to your spelling,you will make less mistakes.I paid thirty yuan to two kilos of meat

If you pay more attention to your spelling, you will make less mistakes. 该句没有错。
I paid thirty yuan to two kilos of meat. 将to变为 for.
hpay for
1. 为…而付钱；负担…的费用：
“Have you paid for these books?”“Yes, I have paid thirty dollars for these book.”
“这些书的钱你付了吗?”“付了，我付了30美元。”
2. 赔偿；补偿：
Of course, I'm quite willing to pay for the lost bike.
当然，遗失了自行车我愿意赔偿。
3. 付出…代价；为…受到惩罚；得到…的报应；吃亏：

less改成few
to改成for