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(English is not my native language.) Is the sentence 'only then did she realised the sun was setting.' correct? Or should I write 'only then did she realise the sun was setting.'? Is 'did' even correct at all in this sentence?

  • Only then did she realise the sun was setting. Because you conjugated did and realise is in the infinitive. – aparente001 Sep 1 '17 at 4:14
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    The plain form "realise" is required because the dummy auxiliary verb "do" requires a bare infinitival clause as complement. – BillJ Sep 1 '17 at 6:08