哪些句子肯定句改否定句时,要把and改成or?Ican sing and dance.Look and say.等

哪些句子肯定句改否定句时,要把and改成or?Ican sing and dance.Look and say.等 Tom can sing and dance.（改成否定句） she can sing and dance 否定句 英语中的否定句要不要把and改成or Can these girls sing and dance (肯定句） Tom does his homework at home.改为否定句怎么改?l can sing and dance. She can sing and dance well(改为否定句) she can sing and dance.( 改为否定句） She can sing and dance.(改为否定句)给好评. Liu Shumeng can dance and sing.改为否定句 i can dance and sing（改为否定句） Lily can sing and dance.(改为否定句）