原句本身是肯定句呀！
变为否定句：He wasn't in the park yesterday.
she didn't play the violin last night. He didn't wash the clothes yesterday. I wasn't ill yesterday. There were not many things in it. They didn't go home at six.
变为一般疑问句及其回答：Was he in the park yesterday? Yes, he was./No, he wasn't.
Did she play the violin last night? Yes, she did./ No, she didn't.
Did he wash the clothes yesterday? Yes, he did. /No, he didn't.
Were you ill yesterday? Yes, I was. /No, I wasn't
Were there many things in it? Yes, there were. / No, there weren't
Did they go home at six? Yes, they did. /No, they didn't.
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