If she hadn't called, ______________.

• উক্ত বাক্যটি 3rd Conditional যার structure হলো:
» If + Past Perfect (had +V3) + Perfect Modal (S + would have/could have/might have + V3).
» তাই, সঠিক উত্তর: I wouldn't have known.

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

• 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)
» If + Past Perfect (had +V3) + Perfect Modal (S + would have/could have/might have + V3)