in this question you have to show the possession means you have to write a sentence in short words by putting 's
for example
check out the first sentence
sticker has belong to one child
in this sentence they are talking about sticker and the owner of it
so in short words you can write it as child's sticker
- a ring that belong to a boy ---- boy's ring
- a tail that a mouse has---mouse's tail
- prayer that belong to a child----child's prayer
- a field where two deer stay----deer's field
- gift that were given to mom----mom's gift
- a party given by four neighbors---neighbors' party
- a desk belong to a teacher ----teacher's desk
if you focus on 6th sentence so you will notice that there is no 's' after apostrophe this is because there is already 's' at the end of the word so that's why there is no need to put another 's' at the end
same as if you look at the example that they already give you at the first in that sentence there is no s at the end because you can see there is already 's' at the end the of word girl-- girls
