Respuesta:
a- Nicholas is a great student.
Nicholas was a great student.
b- I was not in class yesterday
I was in class yesterday
c- My friends were not in the disco last weekend
My friends were in the dico last weekend
d- Lionel and I were not at home this morning
Lionel and I were at home this morning
Explicación:
The past tense of BE is WAS or WERE. En una forma negativa, se agrega NOT después del past tense.