My brother's used to hard work.改为否定句 My brother _________________ hard work

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My brother's used to hard work.改为否定句
My brother （isn't used to） hard work.
句意：我兄弟不习惯干累活.
be used to sth,习惯于某事.求翻译。Sophie是一名来自中国穷困地区的失明女孩Sophie is a blind girl who comes from the poor area in China.