No improvement to this sentence is necessary. It makes perfect sense on its own and sounds right. "Either" always takes an "or" else the word wouldn't make sense, as it's meant to contrast binary options.
eg.
I'm either going to eat food or drink water.
Answer:
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The indefinite pronoun neither is always singular.
Neither is the negative counterpart of 'either' which is also singular. The basic principle of Subject-Verb Agreement says that the subject and verb must agree with each other, so you should use a singular verb because 'either' and 'neither' are considered singular; however, this principle is sometimes broken by a plural verb which can be used after 'either' and 'neither' informally.
The two plural or possessive errors are the following;
<h3>What are the two plural or possessive errors?</h3>
The two plural or possessive errors are the ones that use the wrong placement of the apostrophe and the letter s. In the instances above, we can see that there was no need for the apostrophe after the letter s in the word, Bird-watchers.
Also, in the second instance, there was a need to put the apostrophe after the letter d in the word, Birds. The correct ways to write these are Bird-watchers and 'The bird's...' So, the two words identified above are the errors.
Learn more about possessive errors here:
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B. The overall mood created in a story