Question

1)
As soon as the teacher entered in the class the students stood up.
Rewrite the sentence using 'No sooner than)
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Answer 1

No sooner had the teacher entered the class than the students stood up.

Explanation:

‘No sooner than’ is a correlative conjunction. A ‘correlative conjunction’ is a pair of conjunctions joining two incidents taking place one after the other in a sentence. ‘No sooner’ is attached to the first part of the sentence and is followed by an auxiliary verb before the subject. ‘Than’ is used in the second part of the ‘sentence’ and is followed directly by the subject. In place of ‘had’ ‘did’ can also be used.  

Answer 2

Answer:

no sooner did i entered the class then all the student stood up