What's the correct way to say this:
"Each of the children has/have a bedroom."
Can we say:
"Each children has a bedroom."
"Each child has a bedroom."
You could say, "Each of the children has a bedroom."
(After "each of" and "every of" the verb is usually singular.)
But I think "Every child has a bedroom" sounds less formal.
You can't say "each children has a bedroom," since "each" requires a singular noun.
For example, "Each child has a bedroom."
The exception is when a "each" is used after a plural subject.
For example, "The children each have a bedroom."
For more details, check out this great explanation on each/every in the Oxford Advanced Learners Dictionary.