Crossroads is a special case and can be used with singular and plural verbs.
Singular: The crossroads does need a traffic light.
Plural: All of the main crossroads eventually end at the river.
There is no singular form for 'crossroads'; there has to be two or more roads for roads to cross.
Are is plural. "Is" is singular. For example, "There is a glove on the chair". That is singular. "There are gloves on the chair". That is plural.
Who may be singular or plural.
diagnosis is singular diagnoses is plural sis = singular ses = plural
Atrium is singular - the plural is atria.
The form crossroads is a plural noun; the singular form is crossroad.
There is no singular form for 'crossroads'; there has to be two or more roads for roads to cross.
practitioner is singular (plural practitioners)sofa is singular (plural sofas)satellite is singular (plural satellites)clips is plural (singular clip)dentist is singular (plural dentists)dollars is plural (singular dollar)article is singular (plural articles)magazines is plural (singular magazine)laminator is singular (laminators is plural)radios is plural (singular radio)
singular and plural
This statement is not entirely accurate. While many nouns that have plural forms do indeed indicate a plural meaning (e.g. dogs, cats), there are exceptions. For example, the noun "news" is plural in form, but it is used to refer to a singular concept or piece of information. Similarly, the noun "pants" is plural in form, but it represents a singular garment worn on both legs.
Singular: book / Plural: books Singular: cat / Plural: cats Singular: child / Plural: children Singular: foot / Plural: feet
Are is plural. "Is" is singular. For example, "There is a glove on the chair". That is singular. "There are gloves on the chair". That is plural.
"Has" is singular, e.g. He has, she has. "Have" is plural, e.g. They have, we have. The exception is "I" - e.g. I have.
The word team is singular; the plural form is teams.
Who may be singular or plural.
This is singular. These is the plural form.
These is plural, this is singular