Como escribir una oración en ingles afirmativa y en pasadautilizando la palabra ¨Be¨?

Afirmativa :

I am a really difficult person

pasado :

I was a really difficult person

te lo explico.

El verbo (be) cuando lo usas con los sujetos ( I, You, He.

Etc) funciona así

Para.

Presente pasado afirmativo afirmativo

I am was / were (se supone que ambos estan correctos)

You are were

He is was

She is was

It is was

They are were

You are were

We are were

Si te das cuenta en presente solo esta am, are, is mientras que en pasado solo hay was / were.