带双宾语的句子如何改为被动语态？

双宾语是指谓语动词后带有两个宾语，指人的叫做间接宾语，指物的叫做直接宾语。把带有双宾语的句子变成被动语态时如果将直接宾语（物）变成主语，要在间接宾语（人）前加上介词to或for。如果将间接宾语（人）变成主语，则不用添加介词。例如：He
gave
me
a
book.这个句子中me是间接宾语，book是直接宾语。变成被动语态时如果将book变成主语时要在me前加一个介词to.--->A
book
was
given
to
me
by
him.--->I
was
given
a
book
by
him
间接宾语（人）变成主语，则不用添加介词.具体加to还是for要根据句型而定，如give
的句型是give
sb
sth=give
sth
to
sb,所以添加介词to。但buy
sb
sth=buy
sth
for
sb
,所以添加介词for.如He
bought
me
a
gift---->A
gift
was
bought
for
me
by
him.---->I
was
bought
a
gift
by
him.

双宾语是指谓语动词后带有两个宾语，指人的叫做间接宾语，指物的叫做直接宾语。把带有双宾语的句子变成被动语态时如果将直接宾语（物）变成主语，要在间接宾语（人）前加上介词to或for。如果将间接宾语（人）变成主语，则不用添加介词。
例如：He
gave
me
a
book.这个句子中me是间接宾语，book是直接宾语。变成被动语态时如果将book变成主语时要在me前加一个介词to.
--->A
book
was
given
to
me
by
him.
--->I
was
given
a
book
by
him
间接宾语（人）变成主语，则不用添加介词.
具体加to还是for要根据句型而定，如give
的句型是give
sb
sth=give
sth
to
sb,所以添加介词to。但buy
sb
sth=buy
sth
for
sb
,所以添加介词for.
如He
bought
me
a
gift---->A
gift
was
bought
for
me
by
him.
---->I
was
bought
a
gift
by
him.