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Either and Neither are used with an auxiliary or modal verb to express agreement in the negative (as compared to expressing agreement in the affirmative, when we use "Too" or "So"), e.g.

			"I haven’t been to France. I haven’t either / Neither have I." ("I have been to France. I have too / So have I.")
			"I can’t see the screen. I can’t either / Neither can I."

Either is used with a negative verb; Neither is used with an affirmative verb.

For further information, please have a look at the web sites listed below. If you do a search through the document for "either" or "neither", you should find the relevant information quickly.

http://www.bartleby.com/64/C001/026.html#EITHER1

http://www.bartleby.com/64/C001/038.html#NEITHER1