The passive form of: I decided to write a memo.

- Active: I decided to write a memo.
- Passive: I decided that a memo should be written.

• Agree/ be anxious/ arrange/ determine/ be determined/ decide/ demand + infinitive + object যুক্ত Active voice কে passive করার নিয়ম:
- প্রদত্ত Active voice এর subject ও verb বসে।
- that বসে।
- infinitive এর পরের Object (direct object) বসে।
- should be বসে।
- infinitive এর পরের verb এর past participle বসে।

• More examples:
- Active: She decided to repair the car.
- Passive: She decided that the car should be repaired.

- Active: They agreed to sign the contract.
- Passive: They agreed that the contract should be signed.

Source:
1. A Passage to the English Language by S M Zakir Hussain.
2. Advanced Learner's Communicative English Grammar and Composition by Chowdhury and Hossain.