The past tense is realised (British English) or realized (US English)
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Began is past tense. Begin is present tense.Sample text:"Let's begin at the beginning. It was early last year that I first began to realise that my memory was not good as I had thought. But I can't remember what it was that made me realise this."
the past tense of am is was and the past tense of has is had
the present tense of realised is realise. As in "It didn't take long to realise he left the house with no trousers on".
The infinitive form is "to realise" (British spelling). It is regular. I realised you realised (singular) he, she or it realised we realised you realised (plural) they realised An example is: I realised that I was in trouble when the boat sank.
The past tense of "has" is "had" and the past tense of "have" is "had."