英语从头学：on one's own/by oneself

表达：on one's own/by oneself 一个人，可以用do something on one's own/do something by oneself 一个人做某事

e.g. I'm so lonely. I hate living on my own. 我好孤独啊。我讨厌一个人住。

e.g. I'm so lonely. I hate living by myself. 我好孤独啊。我讨厌一个人住。

e.g. I'm going to say hi to Chris. He is on his own. 我去跟Chris打个招呼。他一个人。

e.g. I'm going to say hi to Chris. He is by himself. 我去跟Chris打个招呼。他一个人。

其他知识点：

1) lonely /ˈloʊn.li/ adj. 孤独的，孤单的；

2) say hi to someone 跟某人打招呼

3) hate doing something 讨厌做某事