Question

As soon as he reached the school , he fainted.
Into negative

Answer 1

The given sentence can be turned into a negative sentence as shown and explained below:

No sooner had he reached the school than he fainted.

Explanation

No sooner….than…is an idiomatic expression which means something happens immediately after something else. We have to use this expression together. it means whenever we use ‘no sooner’, we will always have to use ‘than’ with it.  

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Answer 2

Negative sentence:

He didn't faint until he reached the school.

Explanation:

• The negative sentence is any type of sentence with negative meaning in it. There should be usage of negative word in the sentence.
• In the given sentence, the subject has not fainted before reaching the school. Thus, the word "until" is used in the sentence.
• The word "didn't" which is possessive form of "did not" defines the negative sentence.