So - Too - Either - Neither

                 

Agreeing with affirmative statements

I am playing in the game
So am I (I am playing in the game too)

With be as the main verb

Subject + be           and + so + be + subject

Amy is a twin and so is Sue

Amy is a twin and Sue is too

WITH ALL AUXILIARY VERBS

Amy has had two sons and so has Sue

Amy has had two sons and Sue has too

Amy likes dogs and so does Sue

Amy likes dogs and Sue does too

Amy isn’t very tall and neither is Sue

Amy isn’t very tall and Sue isn’t either

Amy can’t ski and neither can Sue

Amy can’t ski and Sue can’t either

Amy doesn’t like cats and neither does Sue

Amy doesn’t like cats and Sue doesn’t either