‘What they did WAS reprehensible’ -- OK ‘All the things that they did WAS disgraceful’ -- All the things that they did WERE disgraceful. The subject ('all the things') is plural, so the verb must be plural too. ‘All of the theories that have been discussed ARE valid’ -- OK ‘The action taken against them WAS disgraceful’ -- OK ‘The actions taken against them WERE disgraceful’ -- OK ‘What they did IS important’ -- OK
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