change into把...变成...
You can't change iron into gold.
你不能把铁变成金。
I want to change dollars into pounds.
我想把美元换成英镑。
A:Yesterday I bought a sweater from your I'm afraid it's too small I want to change that into a bigger one.
昨天我在你们店里买了一件毛衣，我恐怕它太小了，我想换个大一点了.
B:Ok,wait a minute.
好的，请稍等。