Final answer:
After expressions of quantity and negative expressions, indefinite and partitive articles are omitted. Indefinite pronouns require verb agreement, with some taking singular verbs and others plural. This agreement depends on whether the noun being referred to is singular or plural.
Step-by-step explanation:
Indefinite and partitive articles become omitted after most expressions of quantity and after negative expressions. For instance, expressions of quantity such as 'a lot of,' 'plenty of,' 'much,' and 'many' do not require the use of indefinite or partitive articles when they precede a noun. Similarly, after negative expressions like 'not much,' 'not many,' or 'none of,' the articles are also omitted.
When using indefinite pronouns, it's important to note their agreement with verbs. For example, indefinite pronouns that take a singular verb include 'anybody,' 'anyone,' 'anything,' 'each,' 'everybody,' 'everyone,' 'everything,' 'nobody,' 'no one,' 'nothing,' 'one,' 'somebody,' 'someone,' and 'something.' This is illustrated in the sentence, 'Everyone in the class has prepared a research proposal.'
Conversely, the following indefinite pronouns take a plural verb: 'both,' 'few,' 'many,' 'others,' and 'several.' An example of this usage is, 'Both of the suspects deny committing the crime.' Additionally, some indefinite pronouns such as 'all,' 'any,' 'enough,' 'more,' 'most,' 'none,' and 'some' will take a singular or plural verb depending on the context of the sentence—whether the word they refer to is singular or plural.