So do I

To say that A is or does the same as B, we can use so + auxiliary verb + subject for affirmative sentences and neither (nor) + auxiliary verb + subject for negative sentences.

A: “I am from London.”  B: “So am I.” (=I am from London too.) A: “I’m not tired.”  B: “Neither am I.” (=I am not tired either.) Nor am I

After so/neither we use the same auxiliary or modal verb as in the first sentence: be, do, have, can, will, must, etc.

A: “Tomas is not going to the party.”  B: “Neither is Sally.” (Nor is Sally)

A: “I’ll be here at 7.”  B: “So will I.” A: “Lisa can play the guitar.”  B: “So can Tim.”

When there isn’t an auxiliary or modal verb in the first sentence, we use do/does for present and did for past.

A: “I want to leave.”  B: “So do I.”

A: “George loves chocolate.”  B: “So does Bruno.”

A: “I went to bed very late.”  B: “So did I.”

Neither is a negative word, like not. For this reason, the auxiliary verb after neither should be affirmative.

A: “I didn’t see the film yesterday.”  B: “Neither did I.” (NOT Neither didn’t I)

A: “Ray couldn’t answer the question.”  B: “Neither could Jimmy.” (NOT Neither couldn’t Jimmy.)

​I am happy - Oh, I 'm not

I live in a wonderful country - Oh, I don't

I was in Australia - Oh, I wasn't

I got tired yesterday - Oh, I didn't

I don't like candies - Oh, I do

I wasn't angry with him - Oh, I was