一般要去掉句中的not ,还要根据具体的句子具体来分.
例如：
She doesn't like her mother.
---She likes her mother .
We don't have an English lesson this morning .
---We have an English lesson this morning .
He didn't go to the shop yesterday .
He went to the shop yesterday .
暂举这几例,如不明白欢迎再问.