1. Subject/Verb Agreement
Making subjects & verbs all singular or all plural to avoid confusing your reader or writing something like. . .
“Wells, I justs wanna sounds more edumacated like you is!”
See WR: G1a-k pp (8th ed) (7th ed)

2. Everyone was/is looking forward to summer.
S/V Agreement Part 1
1) Everyone were looking forward to summer.
Everyone was/is looking forward to summer.
2) Tim and Maria is revising their papers.
Tim and Maria are/were revising their papers.
3) The park near those apartments have no tables.
The park near those apartments has no tables.

3. The trees by the classrooms near the building where the lecture will be given (is are) old. The trees by the classrooms near the building where the lecture will be given are old. (G1.b) Everyone (wants want) to avoid having missing assignments in class. Everyone wants to avoid having missing assignments in class.

4. Neither topic (sound sounds) exciting for my paper.
Neither topic sounds exciting for my paper.
Neither of those apps (is are) worth buying.
Neither of those apps is worth buying.
G1.e, pp (8th) or p. 197 (7th)
(See Indefinite Pronouns like everyone, no one, nobody, everybody, either, neither that are almost always singular.)

5. Lisa and Frank (believes believe) writing their synthesis papers will be exciting.
Lisa and Frank believe writing their synthesis
papers will be exciting. (G1.c)
A rum and coke (tastes taste) good after the
semester is over.
A rum and coke tastes good after the
semester is over. (G1.c)

6. Either Tim or Corky (has have) just checked grades using Engrade
Either Tim or Corky (has have) just checked grades using Engrade. Either Tim or Corky has just checked grades using Engrade. (G1.d) Neither the final paper nor the quizzes (was were) too difficult in English 53 or 50. Neither the final papers nor the quizzes were too difficult in English 53 or 50. (G1.d)

7. A crowd of fans (is are) anxious to buy tickets for
the Aerosmith/Kiss reunion concert.
A crowd of fans is anxious to buy tickets for
the Aerosmith/Kiss reunion concert. (G1.f)
Many fans in the crowd (was were)anxious to see
Many fans in the crowd were anxious to see the
Aerosmith/Kiss reunion concert. (G1.f)
(See Collective Nouns G1.F like crowd, team, jury, class, family, committee which are usually singular.)

8. The nightly news (shows show) many
possible essay topics I might write on.
The nightly news shows many possible
essay topics I might write on. (G1. j)

9. Measles (is are) a disease that can be prevented.
Measles is a disease that can be prevented. (G1. j)
(See G1.J for words ending in “S” but are usually consider singular: news, measles, statistics, politics, mathematics, etc.)