Yes, it is a conditional sentence. If everything he has told is true, then she must be upset (now). If everything he told yesterday was true, then she must be upset (now).
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MrWonderfulSo there aren't to be any grammar difficulties. I mean like sequence of tenses or some other kinds. Which rule works in such situations?The traditional 'rules for conditionals can be useful, but they are rather over-simplified. In most books they appear to be far too dogmatic about the 'sequence of tenses'. It is not possible to give a full explana