Ought to vs. should

[John]

Test No. incompl/inter-73 "Modal Medley", question 4

It's the right thing to do in this situation and it's my belief that you ......... to go.

(a) should
(b) might
(c) ought

Test No. incompl/inter-73 "Modal Medley", answer 4

It's the right thing to do in this situation and it's my belief that you ought to go.

Correct answer: (c) ought

Your answer was: incorrect
It's the right thing to do in this situation and it's my belief that you should to go.
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Hello!
Why "should" doesn't fit?
thank you

[Alan]

Should is NOT followed by a preposition.
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English as a Second Language
You can read my ESL story Present Simple

[Sonia*]

A very sweet and bright good morning to all and sundry ESL Teachers,

Please tell me complete uses of "should". How "ought to" is different from "should" and
In what sort of situations both may be used.Please provide me some examples also.

Thanks a million in advance.

Sonia* :D