Premise: "A young boy in a white shirt surrounded by several other children who are rollerskating."
Hypothesis: "A boy is all alone."
Do we know that the hypothesis entailed by the premise?

no
Explanation: The boys can either be surrounded by several other children or all alone..

Given the sentence "Laying on a couch in ikea." is it true that "Someone is on a couch."?

yes
Explanation: Laying on a couch in Ikea implies they are someone on a couch..

Given the sentence "A man is riding his bike through a wooded area in the morning." is it true that "A man is riding his bike and saw the sunrise."?

it is not possible to tell
Explanation: By the first sentence we are not given information that it is his bike or even the time of day..

Premise: "Two men walking their bikes."
Hypothesis: "The men are sunbathing on a beach."
Do we know that the hypothesis entailed by the premise?
no
Explanation: One can only be sunbathing on a beach or walking their bikes..