No X is so ... that ...[don't/won't/should not]...

[Seiichi Myoga]

Please focus on (1).

I think (1) is just ungrammatical, no matter which you choose from among "don't," "won't," and "should not."

(1) No problem is so big that you [don't / won't / should not] find a solution to it.
cf. No problem is so big that you can't find a solution to it.

Do you agree?

Thank you in advance
Seiichi MYOGA

[Barb_D]

I think "won't" works. The implication is "if you look long or hard enough."

[Jamie (K)]

Any of the variations of (1) is perfectly grammatical.

"No problem is so big that you don't find a solution to it." = Mister, you find a solution to any problem, no matter how big it is!

"No problem is so big that you won't find a solution to it." = Mister, you're so good at solving problems that you'll find a solution to any problem, no matter how big it is!

"No problem is so big that you shouldn't find a solution to it." = You shouldn't ignore problems or be intimidated by them. No matter how big they are, you should find some kind of solution.

All of the variations are perfectly grammatical.

[Seiichi Myoga]

Dear Barb_D and Jamie (K),

I appreciate your help and comments.

Unfortunately and regrettably, we don't learn what kind of cognition our choice of a modal in an embedded clause (as in "Work hard so that you [may/can/should/will] pass the test." corresponds to. So we tend to fool ourselves that the resulting differences in meaning can be small enough to ignore.

Thank you

Seiichi MYOGA