Question

We began to encounter strong gales.( change into negative)​

Answer 1

Answer:

We did not begin to encounter strong gales.

Answer 2

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We began to encounter strong gales.( change into negative)

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If you don't want to change the meaning,

We did not begin to encounter weak gales.

or,

Didn't we begin to encounter strong gales?

If you want to change the meaning,

We did not begin to encounter strong gales.