This could have worked if I ----been more cautious.
had
have
might
would
Description (বিবরণ) :
প্রশ্ন: This could have worked if I ----been more cautious.
ব্যাখ্যা: 3rd conditionl - এর নিয়মানুসারে Principal Clause - এ could have / would have /might have থাকলে if clause টি Past Perfect হবে। সুতরাং শূন্যস্থানে Past Perfect - এর auxiliary verb 'had' হবে।
