1．除了be之外的其它系动词如get, stay等也可以和过去分词构成被动语态。例如：Their questions haven’t got answered. 2. 含有情态动词的谓语变成被动语态使用“情态动词 be 过去分词”结构。例如： More attention should be paid to the old in this country. This work can’t be done until Mr. Black comes. 3. 含有“be going to”, “be to”等结构的谓语，其被动语态分别用“be going to be 过去分词”和“be to be 过去分词”。例如： The problem is going to be discussed at the next meeting. All these books are to be taken to the library.
