can "one of" +comparative? or add superlative?
Today, I see a sentence:

You see, until recently what makes a planet a planet was one of the simpler concepts in astronomy.

But in my high school, my teacher told me that after"one of",we can only use superlative, not comparative. Did my teacher right?

Question

can "one of" +comparative? or add superlative? 
Today, I see a sentence:

You see, until recently what makes a planet a planet was one of the simpler concepts in astronomy. 

But in my high school, my teacher told me that after"one of",we can only use superlative, not comparative. Did my teacher right?

Answer

Both can be used, but it changes the meaning:

"One of the bigger companies in the world of petroleum" = a company that is bigger than some, but not the biggest

"One of the biggest..." means that it is one of the top few within a certain sector.

Answer

Teachers aren't always right, especially ESL teachers.

The sentence is perfectly correct.

Answer

You can use both :comparative and superlative.

Answers · 3

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