The flowers smell nice. (Make it Passive)

The flowers – Plural হওয়ায় Verb (are) ও Pronoun (they) Plural হয়ে বসবে।
প্রদত্ত বাক্যটি Quasi Passive. Quasi Passive বাক্যকে কয়েকভাবে Passive করা যায়:
The flowers are nice when they are smelt.
The flowers are nice if they are smelt.
The flowers are nice when smelt.
The flowers are nice if smelt.
The flowers are smelt nice.