雙賓語(yǔ)是指謂語(yǔ)動(dòng)詞后帶有兩個(gè)賓語(yǔ),指人的叫做間接賓語(yǔ),指物的叫做直接賓語(yǔ).把帶有雙賓語(yǔ)的句子變成被動(dòng)語(yǔ)態(tài)時(shí)如果將直接賓語(yǔ)（物）變成主語(yǔ),要在間接賓語(yǔ)（人）前加上介詞to或for.如果將間接賓語(yǔ)（人）變成主語(yǔ),則不用添加介詞.
例如：He gave me a book.這個(gè)句子中me是間接賓語(yǔ),book是直接賓語(yǔ).變成被動(dòng)語(yǔ)態(tài)時(shí)如果將book變成主語(yǔ)時(shí)要在me前加一個(gè)介詞to.
--->A book was given to me by him.
--->I was given a book by him 間接賓語(yǔ)（人）變成主語(yǔ),則不用添加介詞.
具體加to還是for要根據(jù)句型而定,如give 的句型是give sb sth=give sth to sb,所以添加介詞to.但buy sb sth=buy sth for sb ,所以添加介詞for.
如He bought me a gift---->A gift was bought for me by him.
---->I was bought a gift by him.