So - Neither - Either
SO
SO is used to show agreement with positive statements.
SO + Auxiliary/Be + Subject (pronoun)
The Auxiliary (or To Be/Have) needs to agree with the verb tense in the original statement.
It is similar to using TOO at the end of a sentence.
Person A
Person B
I am happy.
So am I.
= I am happy too.
I'm going to Brazil in the summer.
So am I.
= I am going to Brazil too.
You look nice today.
So do you.
= You look nice too.
Stephanie has a new boyfriend.
So does Mary.
= Mary has a new one too.
We went to the concert last night.
So did I.
= I went to the concert too.
I would love a coffee right now.
So would I.
= I would love a coffee too.
He will win a prize.
So will I.
= I will win one too.
They have finished their homework.
So have I.
= I have finished too.
I can speak two languages.
So can I.
= I can speak two too.
He should study more.
So should I.
= I should study more too.
We could see the mountains.
So could we.
= We could see them too.
My brother had eaten too much.
So had I.
= I had eaten too much too.
Sometimes you can use So + Auxiliary + Subject as a continuation of the first part of the sentence.
John can sing well and so can his brother.
(= John can sing well and his brother can sing well too)
NEITHER
Neither is used to show agreement with negative statements.
Neither + Auxiliary + Subject (pronoun)
The Auxiliary needs to agree with the verb tense in the original statement.
It is similar to using either at the end of a sentence, although Neither is more commonly used,
especially in spoken English. We can also use Nor.
A: I don't understand Spanish.
B: Neither do I. / Nor do I (= I don't understand Spanish either.)
