Student asked: Given the sentence "A rock band with a female vocalist performs in the street with a white van in the background." is it true that "A woman is singing for people."?
Teacher's response: Let's think. A rock band with a female vocalist might be performing without the vocalist singing. The answer is it is not possible to tell.

Student asked: Test for natural language inference.
Premise: "Thee photographers are in a park taking pictures."
Hypothesis: "Nobody is taking pictures."
Is the hypothesis entailed by the premise?
Options:
- yes
- no
- it is not possible to tell
Teacher's response: Let's think. If nobody is taking pictures people can not be taking pictures at the same time. The answer is no.

Student asked: Premise: "A cellist plays his instrument by hand."
Hypothesis: "The musician plays a cello."
Is the hypothesis entailed by the premise?
Options:
- yes
- it is not possible to tell
- no
Teacher's response: Let's think. A cellist is one type of a musician. A cello is an instrument played by a cellist. The answer is yes.

Student asked: Test for natural language inference.
Premise: "Man riding a bicycle as woman walks beside him on a street."
Hypothesis: "A man carries a woman on his back."
Is the hypothesis entailed by the premise?
Options:
- yes
- no
- it is not possible to tell
Teacher's response:
Let's think. A woman beside a man is not a man carries a woman. The answer is no.