Question

1.A crow was very thirsty . 2.The crow was clever - make negative sentences

Answer 1

1.A crow wasn't very thirsty.
2. The crow wasn't clever

Answer 2

when we add the words - no, never, not in any sentences after the auxillary or the helping verb the sentences become negative from possitive.

Negative sentenses are used to express opposing point of view.  

The negative form of the given sentence will be as follows:                              

1- A crow was not thirst.

2 - the crow was not clever