Please answer the following question by reasoning step-by-step. Given the sentence "A man without a shirt is working on the roof of a house." is it true that "A shirtless man is hammering shingles on the roof a house."?. Step-by-step reasoning:

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
Working on the roof of a house does not always mean hammering shingles. So the answer is it is not possible to tell.