[ابو بيشو]

The word number sometimes takes a singular verb, sometimes a plural one, e.g
The number of students in the class is small.
But
A number of students were waiting for the lesson to begin.
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It was Henry and William who broke the window.
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This is one of the best books that have ever been written on the subject.
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None of us is perfect.
None of the children in his class are bored with the lesson.
I have checked your answers and none of them are correct.
None but the brave deserves the far.