One could carry this television by oneself.

台电视可以己搬。

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.

个人不能独件事。

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

在种情况下, 对于提高你的习效率至关重要。

It is lonely living by oneself.

个人住很孤独。

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

5. 美国是个以己制造东西的理念而闻名的国家。

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

所有些方法的核心是通过向他人习来培养己思考的能力。

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

“独”，替代个词，你可以说：“个人”，“己”，“他们己”。