Question

We can not dash fans in summer
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Answer 1

Answer:

We cannot do without fans in summer.

The usage of with and without is dependent on the context of the rest of the part of a sentence.

Here, the context is about the summer season and in summer season we will obviously need the fans due to hot weather conditions.

So, without fans we cannot survive in the summer.

In this way, with the help of the reference context, we used the "without" word to fill up the given blank of the sentence.