Had she prepared well, she ______ (pass) the exam.

• Third Condition এর নিয়ম অনুসারে:
- If বা Had যুক্ত দুটি clause থাকে।
- দুটি clause এর যেকোন একটিতে If/ had দিয়ে clause টি শুরু হবে।
- If বা Had যুক্ত clause টি Past Perfect Tense হয়।
- ২য় clause টি Past perfect Conditional (would have, might have, should have, could have) বসে।
- Verb এর Past Participle form বসে।

• Complete Sentence: Had she prepared well, she would have passed the exam.

Source: Advanced Learner's Communicative English Grammar & Composition By Chowdhury & Hossain.