As soon as the bell rang, the students left the classroom. [Negative]

Affirmative: As soon as the bell rang, the students left the classroom.
Negative: No sooner had the bell rung than the students left the classroom.

• As soon as যুক্ত sentence কে Negative করতে হলে:
• Structure:
- As soon as এর জায়গায় no sooner had বসবে,
- প্রদত্ত Sentence এর কর্তা বসে ,
- সে Sentence এর মূল verb এর past participle form বসে,
- sentence এর বাকী অংশ বসে + than + দ্বিতীয় বাক্য অপরিবর্তিত ভাবে বসে।

• Example:
• Affirmative: As soon as he saw the tiger, he ran away.
• Negative: No sooner had he seen the Tiger than he ran away.