If I had tried again -
A. I could solve the problem.
B. I could have solved the problem.
C. I could solved the problem.
D. I could have solve the problem.
সঠিক উত্তরঃ
B.
I could have solved the problem.
Explanation: Conditional sentence এ if যুক্ত Clause-টি Past Perfect হলে Main Clause-টি Perfect Conditional হয়।
অর্থাৎ Subject এর সাথে would have/could have/might have এবং Verb এর Past Participle Form হয়।
Passive এর বেলায় would have/could have/might have + been বসে।
এখানে যেহেতু বাক্যটি Active voice এ রয়েছে তাই পরের অংশে "I could have solved the problem." বসবে।
