EACH OTHER & ONE ANOTHER | Reciprocal pronouns

source: Crown Academy of English     2017年9月5日
“each other” and “one another” are reciprocal pronouns.
We use them to show that each person in a group of people does something to the others. Each person receives the benefits of the action.
In modern English, "each other" and "one another" have the same meaning and use.

Example context - Mark gave Jane a gift and Jane gave Mark a gift.
In this context, we can say "Mark and Jane gave each other gifts." Or we can say "Mark and Jane gave one another gifts."
(There are many more examples and explanations in the video)

We can also form possessive adjectives “each other's” and “one another's”.
A possessive adjective describes who owns something or who possesses something.
Examples:
Mark and Jane often use each other's phones.
Mark and Jane often use one another's phones.

Common mistakes
"each other" is 2 separate words. "eachother" is wrong.
"each other" and "one another" do NOT have a plural form:
"They helped each others." (wrong)
"They helped one anothers." (wrong)

Possessive adjectives: https://www.youtube.com/watch?v=G0VXt...
Personal pronouns: https://www.youtube.com/watch?v=gJrMk...
Possessive pronouns: https://www.youtube.com/watch?v=HZe5L...
Reflexive pronouns: https://www.youtube.com/watch?v=8JJtU...