Native English speakers, could you please help me with these issues?

Are these sentences correct: a) "I'm currently attending a course to UPGRADE my English." (Does the verb 'upgrade' make sense in this context?) b) "Maybe the most difficult part of learning another language is ADJUSTING your brain to a different language structure." c) ... show more Are these sentences correct:


a) "I'm currently attending a course to UPGRADE my English." (Does the verb 'upgrade' make sense in this context?)


b) "Maybe the most difficult part of learning another language is ADJUSTING your brain to a different language structure."


c) "Maybe the most difficult part of learning another language is ADAPTING your brain to a different language structure."
2 answers 2