English has specific short forms for agreeing and disagreeing with statements — "So do I", "Neither do I", "Me too". These short responses depend on whether the original statement is positive or negative and whether it uses an auxiliary verb or a main verb. Getting them right makes your conversation sound natural and fluent.
Practice
"I love Italian food." — "___ my sister."
"I'm really tired today." — "SoI. It's been a long week."
Put the words in the correct order:
"I don't like horror films." — "___ I."
"She can't swim." — "Neitherher brother."
Put the words in the correct order to agree with: "I haven't seen that film yet."
"I love classical music." — "___ (disagreeing). I find it boring."
"I'm not ready yet." — "Actually,— I was just waiting for you."
Respond to disagree with: "We can't afford to travel this year."
"My brother has already finished the report." — "___ Sarah, I think."