We do n't usually study these subject very deaply .
We do n't usually study these subjects very deeply . We do n't usually study these subjects very deeply . We do n't usually study these subject very deeply . We do n't usually study these subjects very deeply .
We do n't usually study these subjects very deeply .
この文の文法を修正してください: We do n't usually study these subject very deaply . 出力: