I don't want to leave my mother at home on her own.我不想把我母亲单独一人留在家里。Knitting and watching television are her resorts when she is alone.她单独一人的时候常以编织看电视聊解孤寂。Are you alone or with a companion?你单独一人还是与朋友在一起? We can't have Jamie walk to school by himself.我们不能让杰米单独一人步行上学。