1. We use every before a singular noun
every + singular noun
- I see her every day (NOT… every days)
- Every room is being used
2. We use every one of before a pronoun or determiner (for example the, my, these). The pronoun or noun is plural
every one of us/you/them
every one of + determiner + plural noun
- His books are wonderful. I’ve read every one of them
- Every one of the plates is broken
3. We can use every one without a noun
- Every one is broken
- I’ve read every one
4. Every is used with a plural noun in expressions like every three days, every six weeks
- I go to Italy every six weeks
5. Everybody, everyone and everything are used with singular verbs, like every.
- Everybody has gone home (NOT Everybody have…)
- Everything is ready.