1. B is, singular
The subject of this sentence is box. There is only one box so it needs a singular verb. Crackers is in a prepositional phrase so it is not the subject of the sentence.
2. D. Has he ever been there before?
The subject of the sentence is He and the verb phrase is has ever been. He is singular so the verb must be singular as well. The other subject-verb pairs are: boys-is, sisters-does sing, she-were.
3. A. Somewhere under the couch cushions is the remote control.
The subject of the sentence is somewhere which is singular. Is agrees with a singular subject. The other subject-verb combos are: some-was, dolphins-swims, the wedding-come.
4. B. She and her aunts have voted in the election.
Replace the compound subject with "they" and test. They have voted - correct. They is - wrong. They makes - wrong. They stops - wrong.
5. B. Either biking or skateboarding is something we can do together.
Since these are all about one OR the other, the verb must agree with a singular subject. Replace the subject with "it" and test. It seem - wrong. It is - correct. It are - wrong. D is different. The options closest to the verb is plural (boys). The verb must agree with the option that is closest to the verb. They claims - wrong.
6. D. Has anyone here taken the trolley before?
The pronouns (anyone, each, nobody) are all singular pronouns and therefore must have a singular verb. Several is a plural pronoun and must have a plural verb.
7. C. A few of the vegetables from the farm are still in the refrigerator.
This is correct because few is a plural subject and are is a plural verb. Everyone is singular and must use a singular verb. In option B, I is singular. D is plural so the verb must be plural as well.
8. D. Which is worse, a rainy vacation or no vacation at all?
The comparison words being used in the options are worst, badder, more worse, and worse. “More worse” and “badder” are never grammatically correct. Worst is a noun. It is used in a sentence such as “That dog is the worst.”
9. C. No one here ever saw any kangaroos before.
It is important not to double up on the negatives. Option A has not and no. Option B has not and nothing. Options C only uses No. Option D has not and none. Option C is the only sentence without double negatives.
10. B. except
Except means to leave something out. Accept means to bring something in. Since Tanya is not going, she is the one exception - the one left out.
11. A. effect
Effect is correct here because you need a noun. Effect is a noun. Affect is an action.
12. B. a lot
A lot is two words not one. Never choose alot as one word.
13. A. have
Have is a helping verb. Of is a preposition. Could have done is a verb phrase. When speaking many people use could’ve instead of could have which causes the incorrect usage with the word of.
14. A. Whom
To decide whether or not you use Who or Whom, replace it with he or him. The sentence would be You invited HIM to the picnic. The answer would be whom. Grammatically, the answer needs to be an direct object since it is the receiver of the action, invite. The direct object form is whom. Who is used for the subject of the sentence. You is the subject because you is the one doing the inviting.
15. D. Is Elm St. where we saw a bank?
Option A is wrong because commas are not end marks. B could be correct, but it’s unlikely that it is worth exclaiming. C is definitely wrong since it is a telling sentence not a question. Option D is a question.
16. C. I suppose you’ll say they also race pet snakes, fleas, and hamsters.
The commas are used to separate the items in a list. Option A is missing a comma between the items. Option B has an extra comma after the verb are. Option D is also missing a comma in the list.
17. B. The snow is piling up, and the plows are unable to clear the roads.
A is wrong because commas do not go after a conjunction (and). Option B is correct because the comma is before the conjunction (and) that joins two complete sentences. Option C is wrong; it needs a comma before yet. Option D is wrong because there is a comma after the conjunction (but).
18. B. No, Doctor Briggs, the medicine did not work.
Option B is correct because addressing Doctor Briggs interrupts the main idea of the sentences.
19. B. The final painting, a huge landscape, impressed me most of all.
The appositive phrase “a huge landscape” must be surrounded by commas because it is extra information that describes the type of painting.
20. D. Their wedding was on July 5, 1990, in Sudbury, Massachusetts, near Boston.
There must be a comma between the day and year when writing a date. There must also be a comma between the town and state. The comma after Massachusetts is actually showing the extra appositive phrase that describes Sudbury’s location.