he bought a pair of glasses yesterday.改成否定句和一般疑问句

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heboughtapairofglassesyesterday.改成否定句和一般疑问句heboughtapairofglassesyesterday.改成否定句和一般疑问句heboughtapairo

he bought a pair of glasses yesterday.改成否定句和一般疑问句
he bought a pair of glasses yesterday.改成否定句和一般疑问句

he bought a pair of glasses yesterday.改成否定句和一般疑问句
否定:He didn't buy a pair of glasses yesterday.
疑问:Did he buy a pair of glasses yesterday?