(1)当宾语从句是由陈述句转化而来时,用that引导
“She is a good girl,”the teacher told us.
→The teacher told us(that)she was a good girl.
(2)当宾语从句是由一般疑问句转化而来时,宾语从句用whether或if连接,句尾的标点符号取决于主句
“Are you from Japan?”he asked me.
=He asked me if/whether I was from Japan.
“Do you like watching TV?”he asked me.
=He asked me if/whether I liked watching TV.
(3)当宾语从句是由特殊疑问句转化而来时,连接词就用原来的特殊疑问词,但从句一定要注意用陈述句语序
When did he leave for Japan? Could you tell me?
=Could you tell me when he left for Japan?