The plural is not acceptable. Use 'all training is'.
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Mister MicawberThe plural is not acceptableDo you mean the plural 'trainings' is always not acceptable, or that the plural is not acceptable only in this case? For example, can I say this?
OttoJDo you mean the plural 'trainings' is always not acceptableThat's what I mean. At least I cannot think of a case in which 'training' is not the standard.