Which one is the correct tag question?

The correct tag question is:

ঘ) You speak Bangla, don't you?

Tag question-এর structure হলো:
Main statement + comma + auxiliary verb + subject pronoun?

Option ঘ) এই structure টা perfectly follow করে:
"You speak Bangla, don't you?"

• Main statement: "You speak Bangla" (positive statement)

• Tag question: "don't you?" (negative tag for positive statement)

Other options ভুল কারণ:

• Option ক) "Nothing is certain, is that?" - এখানে "is that?" ভুল, সঠিক tag question হবে "is it?"

• Option খ) "There is something wrong with her, isn't there?" - এখানে "isn't there?" ঠিক আছে, কিন্তু main statement টা "There is something wrong with her" awkward এবং less common।

• Option গ) "Most of them know English, didn't they?" - এখানে "didn't they?" ভুল, কারণ main statement টা present tense-এ আছে, তাই tag question হবে "don't they?"

তাই, correct tag question টা হলো option ঘ।