Staff, for all intents and purposes, is singular. There is one staff. Definition 5.e. in Merriam-Webster's entry allows for use as plural, however, the preferred use is singular. Think of "staff" as the sum total of the parts. (As the pie is made up of the slices.) PREFERRED: "Fifteen members of the staff attended the meeting." AVOID: "Fifteen staff attended the meeting." In addition, most publications that follow Associated Press guidelines will use only the singular. When in doubt, avoid the word. Recraft the sentence using a different word, like "employees," or "workers."
It can be either
Staff, as in "This office space is big enough for a staff of fifty," or "Most of the staff usually go to the corner bar after work," is a SINGULAR noun.
The plural form of staff is staffThe plural of staff is either staffs or staves. Most meanings of the word will accept both forms, but the plural of the musical staff is always staves, while the plural of the personnel staff is always staffs.
The word team is singular; the plural form is teams.
These is plural, this is singular
Lance is singular. Lances is plural.
The word 'Phenomenon' is singular. The plural form is 'Phenomena'.
The word metastasis is singular, metastases is plural.
The word "ground" can be both singular and plural. Singular: "The ground is wet." Plural: "The grounds of the park are well-maintained."
Louse is singular. The plural form is lice.
No, the word "list" is singular. The plural form of "list" is "lists."
It's singular. The plural is cafeterias.