Find out which part of the sentence has an error: Iwould have askedyou for dinnerifI had knownthat you are stayinghere tonight.

• Third conditional এর নিয়মানুযায়ী- 
- If clause এ যদি (had + V3) হয়, তবে পরবর্তী clause এ would/could/might + have + V3 + extension ব্যবহৃত হয়।
আবার,
- Conditional sentence- এ Had + Sub + V3 + Extension. এভাবে কোন Sentence শুরু হলে সেটিও Perfect conditional/ 3rd conditional হয়।