QUESTION: Can we conclude from "A man in a welding mask welds a girder." that "The man is wearing a welding mask."?
Options:
- yes
- no
- it is not possible to tell

Let's solve it slowly: A man in a welding mask is wearing a welding mask.
The answer is yes.

QUESTION: Premise: "A man is on a ladder leaned up against a building."
Hypothesis: "The ladder has 7 rungs."
Do we know that the hypothesis entailed by the premise?

Let's solve it slowly: Being on a ladder doesn't imply it has also 7 rungs.
The answer is it is not possible to tell.

QUESTION: Premise: "Three men in hard hats work in a pile of concrete."
Hypothesis: "Three men in hard hats work in a pile of concrete in buildings."
Do we know that the hypothesis entailed by the premise?

Let's solve it slowly:
Working in a pile of concrete in buildings does not follow working in a pile of concrete.
The answer is yes.