No. Whatever he does...
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Anonymous "Whatever he do, I shan't worry.", is subjunctive.It certainly is, but it is wrong in the sentence. Subjunctive is not used in that sort of sentence. It is used in some conditional sentences, with certain mandative verbs and adjective constructions, and in formulaic expressions.
Anonymous In my opinion, the subjunctive can be used anywhere the conditional is used, and it should be used more. TUnfortunately, that is not the way language works, and it is not the way we teach learners here. They need to learn language in use, not what you think 'should be' used.
Mister Micawber, what if the the modification below takes place?Regardless of whatever that he do, I shan't worry.No, not an acceptable structure.