Answer: For singular nouns, and plural nouns that don't end in s, add 's. e.g., He placed the notebook on the student's desk. e.g., He placed the notebooks on the children's desks. For plural nouns that end in s, add only an apostrophe.
Explanation:
I hope this will help.
Addy and I support each other.
Andrew and Brooke annoy each other.
It is not “one another” in any case. Each other is for 2 individuals; “one another” is used for 3 or more people
a) What time does the bank open?
b) What time does English class start?
c) What is your phone number?
d) How much does this school bag cost?
e) What is the best hotel in Gulmi?