I was at home yesterday改成一般疑问句,肯否回答,否定句和特殊疑问句
一般疑问句：Were you at home yesterday?
肯定回答：Yes,I was.
否定回答：No,I wasn't.
否定句：I was not at home yesterday.
特殊疑问句:Who were at home yesterday?
When were you at home?
Where were you yesterday?