Had they chosen a different route, they __________ the traffic jam.

• শূন্যস্থানে সঠিক উত্তর হবে - might have avoided.
- Complete Sentence: Had they chosen a different route, they might have avoided the traffic jam.

• Had + subject + verb এর past participle থাকলে, এরপর would/could/might + have + verb এর past participle form ব্যবহৃত হয় ।
- Structure: Had + subject + verb এর past participle +would have + past participle.
- এই নিয়মানুযায়ী গঠিত বাক্যগুলো 3rd Conditional sentence হিসেবে পরিচিত।

• একটি Conditional sentence  এ দুটি অংশ থাকে।
- 1. Condition বা শর্ত  
- 2. Consequence বা ফলাফল। 

• There are four types of Conditionals:
1. The Zero Conditionals
2. The First Conditionals
3. The Second Conditionals and
4. The Third Conditionals

• এ ধরনের বাক্যগুলোর সাধারণ structure হলো:
• Zero Conditional = If + Present + Present (shows scientific and general truth)
• 1st Conditional = If + Present + Future
• 2nd Conditional = If + Past Simple + Future in Past (S + would/might/could + Base Form of the Verb)
• 3rd Conditional = If + Past Perfect (had +V3) + Perfect Modal (S + would have/could have/might have + V3)