Either and Neither is always used when talking about two thing.

either means this one or the other one.

neither means not this one or the other one . It has a negative meaning

Verb is always singular.

• Either candidate is ideal for the job.

• Either solution is acceptable.

• Either idea is good.

• You can sit on either chair.

• Neither answer is true.

• Neither boy is my friend.

• Neither television works properly.

Either and Neither can be used alone without a noun after.

• We have two computers, but neither works properly.

• I have two bicycles. I can lend you either.

• There are two books here, but neither is mine.

• Both shirts are good. You can buy either.