'Neither' is the negative form of 'either'.
1. A common construction is 'either..or' and 'neither ... nor'. You might say:
'You can speak to her in either English or Italian. Either language is fine. She speaks both languages fluently.'
or
'Neither his father nor his mother speaks English. Neither of his parents can speak English. They only speak Chinese.'
2. Remember that English has a 'no double negative rule'. This means that 'neither' goes with an affirmative verb, while 'either' goes with a negative verb.
I don't play football, and I don't play tennis either = I play neither tennis nor football
3. We often use 'either' and 'neither' as short answer questions when we are agreeing with someone. The same double negative rules applies.
I haven't seen that film.
Neither have I.
I haven't either.
I'm not going to school today.
Neither am I.
I'm not either.
All of these responses, as you can see, would translate as 'Neanch'io'.