Question

as soon as I began to get off to sleep , there is another pool(negative)​

Answer 1

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Answer:

The negative form will be...

As soon as I did not begin to get off to sleep, there is another pool.

Here the verb of main clause changes. as changing form of sentences changes verb of main clause only not subbordinate.

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Answer 2

Answer:

as soon as I began to get off to sleep,there is no another pool.