1在定語從句中one of 后的先行詞若是可數(shù)名詞的復(fù)數(shù),謂語動詞就用復(fù)數(shù)形式,the only one of 后的謂語動詞用的是單數(shù)形式.
e.g.Tom is one of the boy students in our class who are often late.
Tom is the only one of the boy students in our class who is often late.
2,none of要視具體情況而定,如果后面的名詞為復(fù)數(shù)名詞或代詞,謂語動詞要用復(fù)數(shù),如果是不可數(shù)名詞要用單數(shù),如：
None of us know him.
None of the water is clean
3,a group of 后面一定是加可數(shù)名詞,即使有時可能你認(rèn)為不是復(fù)數(shù)形式,那可能是這個詞的單復(fù)數(shù)同形（比如 people,police等）,謂語動詞一般用復(fù)數(shù)
A group of people are talking outside.
A group of students are playing on the playground.
A group of workers are working in the park.