Practice Questions

It's' (it is) requires an apostrophe. A semicolon is correctly used to join two independent clauses.

Parallel structure is maintained by using the gerund form for all three activities.

The sentence structure requires a main verb that matches the past tense established by 'worked' and 'studied'.

Parallelism requires the same verb tense in both parts of the 'not only... but also' construction ('did finish' and 'edited').

Parallelism requires that a list of items share the same grammatical form (gerunds: reading, swimming, playing).

This corrects a dangling modifier; the original sentence implied the trees were walking.

The subject is 'quality' (singular), not 'apples'. 'Is' is the correct singular verb.

Bread and butter' functions as a singular unit representing a single meal, so it takes a singular verb.

A number of' is plural. 'The number of' would be singular. Thus, 'have' is correct.

Economics', like other names of fields of study ending in -s, takes a singular verb.