Identify the auxiliary
He hasn’t finished his homework.
→ What is the auxiliary?
has
I like pizza.
So do I.
I don’t like onions.
Neither do I
"They were talking on the phone."
→ What is the auxiliary?
were
She will travel next month.
So will I.
She didn’t enjoy the movie.
Neither did I.
I live next to the shopping mall.
→ What is the auxiliary?
"do" (from simple present)
I have finished my homework.
So have I.
I haven't seen that movie.
Neither have I.
She plays tennis on Saturdays.
→ What is the auxiliary?
Does (from simple present)
She is very organized.
So am I.
He isn’t coming today.
Neither am I.
She was planning a trip to Curitiba
→ What is the auxiliary?
"Was"
They went to the beach.
So did I.
He won’t be there.
Neither will I.