一、及物动词通常可变为被动语态,不及物动词则通常不能。如:The students have read the book→The book has been read by the students.The foreigners arrived this morning.二、带双宾语的动词变为被动语态时,有两种情况:(1)将间接宾语变为被动句的主语,直接宾语不变;(2)将直接宾语变为被动句的主语,并在间接宾语前加上介词 to 或 for。变为被动语态时其间接宾语前加 to 的有:give,pass,bring,teach,show,tell