具体的用法参考例句就可以了。..:)
alone 副词 adv. 单独；独自
by yourself;with no other people
· She went home alone.
她独自回家去了。
· It's foolish of him to go alone.
他单独去未免太傻了。
· When his wife died, he lived alone.
他的妻子死后，他一个人生活。
· An elderly patient was sitting in her wheelchair alone.
一位上了年纪的病人孤单单地坐在轮椅上。
副词 adv. 仅仅；只有
only
· He alone can do it.
只有他才能做这件事。
· You alone can help me.
只有你能帮我忙。
· He alone was in the room.
仅他一个人在房间里。
· The people, and the people alone, are the motive force in the making of world history.
人民，只有人民，才是创造历史的动力。
形容词 adj. 单独的
apart from others
· He is alone.
他独自一人。
· The ticket collector at the gate noticed that he was alone.
门口的检票员注意到他是独自一人。
· We are not alone; we have friends all over the world.
我们并不孤立，我们的朋友遍天下。
lonely词缀： -ly具有某性质的in the specified manner
形容词比较级： lonelier 最高级： loneliest
a. 1.孤独的，寂寞的 2.荒凉的，人迹稀少的
形容词 adj. 孤独的；寂寞的
sad because you are alone,with no friends
· She often felt lonely.
她常感到寂寞。
· I was alone,but I did not feel lonely.
我虽然孤单，但我不感到寂寞。
· Sarah felt lonely when her best friend left the town.
自从她最好的朋友离城以后萨拉感到很寂寞。
· They live a lonely life in a lonely house in the hills.
他们在山中一栋孤零零的房子里过着寂寞的生活。
形容词 adj. 偏远的；人迹罕至的
far away from other places
· Two noblemen took him to a lonely house.
两个贵族把他带到一座僻静的房子里。
· They went to a lonely place in the mountains.
他们到了山中寂寞的地方。