I thought that English is an easy subject to learn..

[Aimal Khan]

Is the following sentence grammatically correct?

I thought that English is an easy subject to learn, but I ended up finding that mastering English language is more difficult and complicated than learning physics or chemistry.

 

[Roman55]

I am not a teacher.

Change the first "is" to "was" and put a "the" before the second "English" and it will be.