Everyone and every one are pronounced the same but have different meanings.
Everyone and everybody talk about all the people in a group. It thinks about the group as one person. It only talks about people.
Every one talks about each person or thing in a group, It thinks about the group as lots of different people or things. It can talk about people or about things, and it’s always used with a singular verb.
- Everyone was looking at her.
(The group was looking at her.) - With everybody gone, she could enjoy the silence.
- I failed every one of the exams.
(There were many different exams, and I failed them all.) - She has sent a letter to every one of her friends.
