On a chair backwards is a rephrasing of sitting backwards on chair.
The question and answer are below.
Premise: "A girl sitting on a chair backwards."
Hypothesis: "A girls is sitting backwards on her chair."
Do we know that the hypothesis entailed by the premise?
yes

*****

In order to be gesturing and smiling at one another they must be face to face not back to back.
The question and answer are below.
Given the sentence "A man gesturing with his hands to a fair haired lady who is smiling." can we conclude that "A man and woman are sitting back to back."?
Options:
- yes
- it is not possible to tell
- no
no

*****

Sentence 1: A man and a boy set up a grill on a sunny day. Sentence 2: A father and son setting up a grill on a sunny friday.
The question and answer are below.
If "A man and a boy set up a grill on a sunny day." does that mean that "A father and son setting up a grill on a sunny friday."?
Options:
- yes
- it is not possible to tell
- no
it is not possible to tell

*****

One cannot prepare to hit a tennis ball if one is sun bathing on a beach.
The question and answer are below.
Can we conclude from "A young man in white shorts prepares to hit a tennis ball." that "A man is sun bathing on a beach."?
Options:
- yes
- no
- it is not possible to tell
no

*****