Eliptical Sentence

Eliptical sentence is the way you combine two sentences which has different subject with the same predicate. it is used to avoid repetition.

When you want to combine two positive sentences, you will need so or too.

Example:

She walks to school every morning.
They walk to school every morning.

Eliptical sentences:

• She walks to school and they do too.

                                   or

• She walks to school and so do they.

The patterns are:

... and + S + Auxiliary + too .

... and + so + Auxiliary + S .

When you want to combine two negative sentences, you will need either or neither.

Example:

She doesn't go to the office.

I don't go to the office.

Eliptical sentences:

• She doesn't go to the office and I don't either.

                                   or

• She doesn't go to the office and neither do I.

The patterns are:

... and + S + Auxiliary + not + either .

... and + neither + Auxiliary + S .

P.S 

You don't need to put 'NOT' when you use 'NEITHER' because neither stands for 'Not + Either'.