This question is originally posted on WordReference forum. My friend suggested me to post here to get more opinions on this question. I don't know if I am allowed to link to other site, so I am going to rephrase the question.
The original sentence is: My main focus is Spanish.
Someone corrected it with: My main focus is on Spanish.
Context: The person is learning multiple languages, but he/she is focusing on learning Spanish.
Is there any difference between the two?
Thank you in advance.
I did search on the site first as well. I found this response but the examples given use "focus" as a verb instead of a noun.