变否定句、一般疑问句并回答、特殊疑问句

1.They weren't happy yesterday.
Were they happy yesterday?Yes,they were./No,they weren't.
2.They didn't visit their grandmather.
Did they visit their grandmather?Yes,they did./No,they didn't.
3.She didn't studied for the math test.
Did she study for the math test?Yes,she did./No,she didn't.
特殊疑问句应划线部分提问吧!