陈述句：I was ill last week.(上星期我病了)
一般疑问句：Was he in beijing last month?(他上个月在北京吗？)
肯定回答：Yes, he was.
否定回答：No, he wasn't.
was只能用于第一人称和第三人称单数的过去式
He was busy.
Was he busy?
Yes,he was.
No, he wasn't.
Lily was at home.
Was Lily at home?
Yes, she was.
No, she wasn't.
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