Just a short grammar guide this week. While this may be a short guide, but it is about one of the most common mistakes I see when checking TOEFL essays.
You must remember that every is normally used before a singular noun. Like this:
“Every house in the neighborhood is expensive.”
Or this:
“I want to eat every cookie in the box!”
–
Do not use a plural noun after “every.” Do not write:
“Every houses in the neighborhood is expensive.”
–
There is one exception, however. You can use a plural noun in expressions that refer to intervals. As in:
“I still talk to him every few days.”
Or:
“We all get together every five weeks.”