Resposta:
5 verbos regulares: happened (aparece 2 vezes), needed, started (2 vezes também), quadrupled, e continued
5 verbos irregulares: was, were, came, said e has
Exemplos de formas negativas p/ esses verbos:
Regulares:
This didn't happened
She didn't need
It didn't start yet
It didn't quadruple
It didn't continue
Irregulares:
Wasn't
Weren't
Didn't come
Didn't say
hasn't
Explicação:
Resumindo, os verbos regulares são aqueles que terminam em "Ed" ou pelo menos "d", exemplo: dance -> danced
Irregulares mudam sua forma, exemplo: drive -> drove
Na maioria dos verbos no passado, vão precisar do auxiliar "didn't", e quando isso acontece eles não precisam mudar, então ficam na forma original
