If I had a pen, I (write) a letter. Here the right form of verb is –
- writing
- would write
- will write
- had written
Answer: would write
Explanation: Third conditional বাক্যের Structure হলো: If + subject + had + verb এর Past participle রূপ , subject + would/could/might + have + verb এর Past participle রূপ + অবশিষ্ট।