【Everyone用法】
everyone = everybody( 指人): 當不好分辨一個句子究竟應該用everyone 還是every one 時,可以用替換法進行判斷。如果可以用everybody 來替換,那麼就應該用everyone,因為 everyone 和everybody 的意思相同。everyone 後面不能接of。

【Every One用法】
every one = each one = each single one(指人或物):不能用everybody 來替換的,就應該用every one,every one 後面常接of,相當於each one 或each single one。

例:
Everyone wants to have fun in the sun.
大家都想在陽光下盡情地玩一玩。
→ Everyone = Everybody

Every one of us wants to have fun in the sun.
我們每一個人都想在陽光下盡情地玩一玩。
→ Every one of us 表示團體裡的每一個人。

Everyone (= Everybody) wanted to talk to the new English teacher.
人人都想跟新來的英文老師聊天 。

Every one of the cabins in this park was built by my grandson.
這個公園裡的每一個小屋都是我的孫子蓋的。
→指物

Claire has four girls, and every one of them loves to wear pearls.
克萊兒有四個女兒,每一個都喜歡戴珍珠。 
→指人

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※ 本文節錄自《英文文法全書【二版】》
※ 延伸閱讀:
[書籍] FUN學初級英文文法(20K彩色)
[講堂] Don't Say It! 600個你一定會錯的英文(32K彩色版)