- Mary and I write to each other/one another every day.
They sat without looking at each other/one another.
- We often borrow each other’s clothes.
They stood looking into one another’s eyes.
Each other/one another are not used as subjects.
We must each listen carefully to what the other says.
(NOT We must listen carefully to what each other-say.)
- They were looking at each other ( = Each person was looking at the other.)
They were looking at themselves ( = Each person was looking at him-or herself.)