Hi.
1) All contestants should have to follow the same rules.
2) All contestants should follow the same rules.
3) All contestants must follow the same rules.
How the above three sentences differ in meaning?
1) It would be a good idea and the right thing to do if all contestants were [obliged / required] to follow the same rules. 2) It would be a good idea and the right thing to do if all contestants followed the same rules. ) 3) It is absolutely mandatory that all contestants follow the same rules.
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1) It would be a good idea and the right thing to do if all contestants were [obliged / required] to follow the same rules.
2) It would be a good idea and the right thing to do if all contestants followed the same rules. (This one lacks the idea of obligation present in the first one above.)
3) It is absolutely mandatory that all contestants follow the same rules.
1) All contestants should have to follow the same rules. This sounds to me like a recommendation for a contest that has no such requirement.
2) All contestants should follow the same rules. A recommendation, but not a strong requirement.
3) All contestants must