Today's lesson is concerned ____ punctuation.

• Concerned for/about
English Meaning: a worried or nervous feeling about something.
Bangla Meaning; কোন কিছু সম্পর্কে উদ্বিগ্ন হওয়া।
Example - I'm a bit concerned about/for your health.

• Concerned in
English Meaning: Involved in something.
Bangla Meaning: কোন কিছুতে জড়িত থাকা।
Nine men were concerned in the plot.

• Concerned with
English meaning: interested in, in a context.
Bangla Meaning:  আগ্রহী/কোন বিষয়ে
Example - Today's lesson is concerned with punctuation.

Source: Longman Dictionary of Contemporary English, Cambridge and Merriam-Webster Dictionary.