Looking on the internet deeply has found these results:

is one of the major problems is the most popular phrase on the web.

is one of the major problem 11,110,000 results on the web	is one of the major problems 11,460,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
And we think, we like to think, that this is one of the major problems why all That is one of the major problems. I believe that that is one of the major problems that has not been properly addressed. Organized crime is emerging as one of the major problems in many countries. Noise pollution is one of the major problems experienced in the urban environment in the EU. The distribution of alternative, accurate information to citizens is one of the major problems facing our society. This is one of the major problems of our times. Global warming is one of the major problems of our times.	Global warming is one of the major problems of our times. Noise pollution is one of the major problems experienced in the urban environment in the EU. And we think, we like to think, that this is one of the major problems why all This is one of the major problems of our times. I believe that that is one of the major problems that has not been properly addressed. The distribution of alternative, accurate information to citizens is one of the major problems facing our society. That is one of the major problems. maybe not all

is one of the major problem

11,110,000 results on the web

is one of the major problems

11,460,000 results on the web

More popular!

And we think, we like to think, that this is one of the major problems why all
That is one of the major problems.
I believe that that is one of the major problems that has not been properly addressed.
Organized crime is emerging as one of the major problems in many countries.
Noise pollution is one of the major problems experienced in the urban environment in the EU.
The distribution of alternative, accurate information to citizens is one of the major problems facing our society.
This is one of the major problems of our times.
Global warming is one of the major problems of our times.

Global warming is one of the major problems of our times.
Noise pollution is one of the major problems experienced in the urban environment in the EU.
And we think, we like to think, that this is one of the major problems why all
This is one of the major problems of our times.
I believe that that is one of the major problems that has not been properly addressed.
The distribution of alternative, accurate information to citizens is one of the major problems facing our society.
That is one of the major problems.
maybe not all