1) Must a) You must have been exhausted after the marathon. b) You must to be exhausted after the marathon. 2) Should a) You should have tell me about the concert earlier. b) You should have told me about the concert earlier. 3) Mustn't a) You mustn't to take photos inside the gallery; It is strictly forbidden. b) You mustn't take photos inside the gallery; It is strictly forbidden.

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