Sentence examples for some problems are from inspiring English sources

SOME problems are particularly tough nuts to crack.

Some problems are organizational.

Some problems are obvious.

But some problems are clear.

Indeed, some problems are glaring.

Some problems are hard to solve.

Some problems are one-offs; they require a local solution.

Some problems are simple and other are complex.

He admitted that some problems are tough and allow no easy solution.

Others say, 'Some problems are not to be solved,' which is a very sad idea.

My only agony is that some problems are multiplying, and new problems are coming up.