Economics... when used with a plural verb. For example, 'what are the economics of such a venture?'
Economics is a collective term. It is used in the singular.
Examples of nouns that are plural in form but singular in meaning include: news, economics, mathematics, physics, and measles. These nouns are used in the singular form even though they appear to be plural.
The plural form of "do" is "do" and the plural form of "don't" is "don't." These words do not change in the plural form when used in a sentence.
The plural form of him, her, or it is them. (objective pronouns)
Bridges is the plural form of bridge.
The plural form of "was" is "were."
The plural form of "I" is "we."
The plural form of "is" is "are."
The plural form of mouth is mouths. The plural form of month is months. The Mounth is a range of hills in Scotland and does not have a plural form.
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
"Groceries" is the plural form of "grocery."
The plural form of "meter" is "meters."