You use either by itself in negative statements to indicate that there is a similarity or connection with a person or thing that you have just mentioned.
He did not even say anything to her, and she did not speak to him either.
他甚至什么都没跟她说,而她也没跟他说话。
When one negative statement follows another, you can use either at the end of the second one to indicate that you are adding an extra piece of information, and to emphasize that both are equally important.
Don't agree, but don't argue either.
不要赞同,但是也不要争辩。
You use either in front of the first of two or more alternatives, when you are stating the only possibilities or choices that there are. The other alternatives are introduced by 'or'.
Sightseeing is best done either by tour bus or by bicycles.
最好乘游览巴士或骑自行车观光。
The former president was demanding that he should be either put on trial or set free.
前总统一直要求要么对他进行审判,要么就无罪释放。
You use either in a negative statement in front of the first of two alternatives to indicate that the negative statement refers to both the alternatives.
There had been no indication of either breathlessness or any loss of mental faculties right until his death.
直到去世,他都没有出现呼吸困难或意识不清的迹象。
Either refers to one of two things, people, or situations, when you want to say that they are both possible.
a special Indian drug police that would have the authority to pursue suspects into either country.
有权到这两国中任意一国追捕嫌犯的印度缉毒特警。
In a negative statement, either refers to each of two things, people, or situations, which are both included in the negative statement.
He sometimes couldn't remember either man's name.
有时候这两个男人的名字他都记不起来。
You can use either to introduce a noun that refers to each of two things when you are talking about both of them.
The basketball nets hung down from the ceiling at either end of the gymnasium.
篮筐分别从体育馆两头的天花板上悬吊下来。
You can use either to refer to one of two things, people, or situations, when you want to say that they are both possible and it does not matter which one is chosen or considered.
There were glasses of iced champagne and cigars. Unfortunately not many of either were consumed.
有很多杯冰镇香槟和雪茄。可惜两样东西都没怎么动。
You use either in a negative statement to refer to each of two things, people, or situations to indicate that the negative statement includes both of them.
She warned me that I'd never marry or have children. 'I don't want either.'
她告诫我千万不要结婚、不要生孩子。“我哪一样都不想要。”
You can talk of either of two things, people, or situations, when you want to say that they are both possible and it does not matter which one is chosen or considered.
Do either of you smoke or drink heavily?
你们俩当中有谁抽烟或喝酒很凶吗?
You can use either of in a negative statement to refer to each of two things, people, or situations, which are both included in the negative statement.
There are no simple answers to either of those questions.
那两个问题都没有简单的答案。