请将下列句子转换成被动语态1.Thepapershavebeensignedbymanager.2.Itshouldbedoneatonce.3.AtalkwillbegivenintheschoolnextMonday.4.Thathousewasbuiltin2000.就是，这些句子被动语态的：基本结构。

Question

请将下列句子转换成被动语态
1.The papers have been signed by manager.
2.It should be done at once.
3.A talk will be given in the school next Monday.
4.That house was built in 2000.
就是，这些句子被动语态的：基本结构。

Answer 1

the manager has signed the papers.
we should do it at once.
the school will give a talk next monday.
we built that house in 2000.