So, Too Either & Neither.

These are used for affirmative agreement :

• I live in Paris and Peter does TOO.
• I live in Paris and SO does Peter.

... or negative agreement:

• I don't live in London and NEITHER does Peter.
• I don't live in London and Peter doesn't EITHER.

EITHER and TOO, in sentences like this will come at the end of the sentence after the verb.

NEITHER and SO come before the verb.

EITHER is also used to indicate that both possibilities are accceptable:

• I would like EITHER a Ferrari or a Lotus. (One will be enough!) not I would like BOTH a Ferrari and a Lotus. (greedy!)
• The boss is away tomorrow. EITHER Smith or Jones will have to open the shop. (but not both)

TOO and SO have other uses and there are examples of these in the text too:

SO for a consequence:

• I have no money SO I am going to the bank.
• It's raining SO I'm staying at home.

or with an adjective or adverb:

• The book was SO interesting that I couldn't put it down.
• He was working SO hard that he didn't see it was six o'clock!

TOO meaning excessive:

• This shirt is TOO big. Give me a smaller size.
• This grammar point is TOO difficult: I'll never understand it!

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