Use "Neither and Nor" in a Sentence

Hi there, 李伟!

'Neither...nor' can join two singular subjects or one plural and another singular subject.

If it is connecting two singular subjects then use a singular verb.

For example: Neither the cat nor the dog finishes its food for lunch so Grace is quite worried.

If it joins two plural subjects then use a plural verb.

For example: Neither the tourists nor the tour guides want to go to the waterfalls today because of the heavy rain.

If it connects one singular subject and a plural subject, use a verb that agrees with the one nearest to it.

Examples: 

> Neither Martha nor her brothers know that there is a chocolate cake in the fridge.

> Neither the teachers nor the principal is aware that one of the students got into an accident this morning.

To answer your homework:

'Neither the teachers nor the principal was at the meeting.