Question

the boys were careful change into negative

Answer 1

HEY MATE!

_______________

Question- The boys were careful(change into negative sentence)

A negative sentence Contains the Negative word "No" or "Not." and it shows that a statement is not true and is a false Accusation. "No" and "Not" are the helping verbs, and it is used after an Auxiliary verb.

Answer- The boys were not careful.

Hope it helps you!