Giving - Expressing Opinion in English

How to give opinion in English? How to express your opinion in English. That us our topic now. Expressing opinion can use the following keywords:
In my opinion....
As far as I concerned....
It is considered that...
According to.....

Using such keywords above can help easily to express certain opinion. The following is the example
In my opinion, learning English is difficult
As far as I concerned English is easy to learn
It is considered that English is not difficult to learn
I find video tutorial on how to give and express opinion in English, watch it