[QUESTION] Given the sentence "A dirt biker competes while onlookers watch." is it true that "A dirt biker competes while onlookers watch and wave their signs and flags."?
A dirt biker competes while onlookers watch does not imply that the onlookers wave their signs and flags.
The answer is it is not possible to tell.

Q: Given the sentence "An older man is pouring something out of a bag into the water." is it true that "A man pours something into the water."?
A: The man is pouring something out of a bag so he pours something.
The answer is yes.

QUESTION: Premise: "A man in a sweater is looking at dirty stairs."
Hypothesis: "The stairs are sparkling clean."
Is the hypothesis entailed by the premise?
Options:
- yes
- it is not possible to tell
- no

Let's solve it slowly: If the stairs are sparkling clean they cannot also be dirty.
The answer is no.

[QUESTION] Premise: "A construction worker works on a metal structure."
Hypothesis: "There is a construction worker building stuff."
Do we know that the hypothesis entailed by the premise?
A worker specified as being in construction is ordinarily involved in 'building stuff'; one who 'works on a structure' is even more likely to be 'building stuff'; 'a construction worker' establishes that there is a construction worker.
The answer is yes.

Q: Premise: "A woman wearing a black shirt with purple flowers and a small girl with blond-hair wearing a purple stand in front a sink while the woman brushes her teeth."
Hypothesis: "The woman has purple flowers."
Is the hypothesis entailed by the premise?
Options:
- yes
- it is not possible to tell
- no
A: Wearing a black shirt with purple flowers does not mean she has purple flowers.
The answer is it is not possible to tell.

[QUESTION] Given the sentence "Three men are standing on top of a mountain." can we conclude that "Three men are happy to be on the mountain."?
Options:
- yes
- it is not possible to tell
- no
Men standing on top of a mountain can have any emotion and don't necessarily have to be happy.
The answer is it is not possible to tell.