Question

1. _______ there pyramids in Mexico?

Answer 1

1. is, "aren't", because pyramids is plural.
2. is, "are", because caverns is plural.
3. is, "is", because it is a singular book; it's only ONE book.
4. is, "doesn't", because it is singular; it's only ONE café.
5. is, "weren't", because we is plural and therefore you would have to use the plural form of, "weren't".
I hope I helped! =D

Answer 2

1. Aren’t the pyramids in Mexico?

The correct answer is “aren’t” since the subject of the verb is “the pyramids”, which is a plural noun and the subject-verb agreement corresponds with the third person plural.

2. Underground caverns are a big tourist attraction in Virginia.

The correct option is “are” because the subject is “underground caverns”, a plural noun that agrees with the verb to be in the third person plural.  

3. Isaac Asimov’s Book of Facts is full of interesting bits of information.

In this sentence, the correct answer is the verb form “is” since the subject refers to the book that is a singular noun, which corresponds with the third person singular. The subject can be replaced by the personal pronoun “it”.

4. Doesn’t the café have a special lunch every day?

The correct answer is “doesn’t” since this is an auxiliary verb in the negative form that agrees with the subject of the question “the café”. The subject could be replaced by “it”, and that is why the auxiliary verb must correspond with the third person singular.

5. We weren’t on the phone for very long.

In this sentence, the correct option is “weren’t” because this is the past form of the verb to be that corresponds with the first person plural “we”.