One could carry this television by oneself.

台电视可以自己搬。

And now for " by oneself." " By" is a preposition.

现在讲by oneself。by是介词。

One doesn't do it by oneself.

一个人不能独自做件事。

In such a case, studying by oneself is crucial to improve your learning efficiency.

在况下, 自对于提习效率至关重要。

It is lonely living by oneself.

一个人住很孤独。

America is a nation known for the idea of making things by oneself.

5. 美国是一个以自己制造东西理念而闻名国家。

The core of all these approaches is developing the capacity to think for oneself by learning from others.

所有些方法核心是通过向他人习来培养自己思考能力。

" Alone" , instead of saying " alone" , you could say: " by oneself" , " on one's own" , " by themselves" .

“独自”，替代个词，可以说：“一个人”，“自己”，“他们自己”。