Question

初中英语语法问题，帮帮忙啊！

one of +形容词最高级+名词复数+谓语动词{是+谓语动词单数还是复数?(举个例子）}
one of+复数名词+定语从句的结构中,如关系代词在从句中做主语,定语从句的谓语动词用复数形式。如：He is one of the boys who are ready to help others. 但是这句话是怎么回事？He was the only one of the boys who was given a prize.
one of +形容词最高级+名词复数+谓语动词{是+谓语动词单数还是复数?(举个例子）}比如说：One of my best friends (这儿是用is还是用are)

Answer 1

谓语动词单数
He is one of the boys who are ready to help others
这句话的 who 是指the boys
He was the only one of the boys who was given a prize.
这句话的 who是指He
One of the students is cleaning windows.这句话好奇怪~
is

Answer 2

前面名定语从句修饰的是the boys(复数)
后面句定语从句修饰的是the only one of the boys,这个词组的中心是the only one(单数)
定语从句中谓语的单复数取决于它修饰的名词是单数还是复数

Answer 3

He is one of the boys who are ready to help others是one of 从句
He was the only one of the boys who was given a prize.是the only one of从句
2者不同