Given the sentence "A worker uses a jackhammer on the street." is it true that "A worker is using a jackhammer in the morning."?
Let's solve step-by-step:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
A worker with a jackhammer is not necessarily working in the morning. A jackhammer can be used at any time of the day or night. The answer is it is not possible to tell.