See also: https://dict.leo.org/cgi-bin/dict/archiv.cgi?...

I would say "staff" is singular and means "a body of persons employed in a business" [Fowler's]. The plural is "staffs", which refers to several such bodies. Staff does not mean "Mitarbeiter" (sing.). It is more like "Personal". It is not a word, like "sheep", that has the same form for singular and plural.

However, it is more complicated than that, because it is a collective noun (like "crew") and can, therefore, take a plural verb (at least in British English).

To make it even more complicated it can sometimes be used like an uncountable noun, without an article ("You can't get staff", "by staff", "members of staff").

In your example, think of "all" as meaning "gesamt" rather than "alle".

Es gibt einen Plural für staff: staffs.
Da sich staff aber schon eine Gruppe von Personen (Mitarbeiterstab, Personal) bezieht ist dieser nicht so häufig.

Mitarbeiter sg. → employee (vgl. französisch employer v. →einstellen, part. passé employé(e) →angestellt)

Mitarbeiter sein: be on the staff of...

Hello,

Wenn es sich um Mitarbeiter handelt gibt es
eine Singularform staff und eine Pluralform also
staffs.

Wenn es ich um Personal handelt gibt es nur
eine Form also staff.

Mitarbeiter (Sg.) ▬ employee (sg.)
Mitarbeiter (Pl.) ▬ staff (sg.), employees (pl.) (~ Arbeitnehmer)
Personal (nur Sg.) ▬ staff (sg.)
∟ bei Pluralgebrauch Mitarbeiterstäbe ▬ staffs

Hello,

Ich bereite mich gerade auf eine Prüfung
vor und in diesem Übungstest kamen eben die
beiden Wörter vor.

staff und staffs

An das letzte Wort meines vorigen Beitrags gehört noch (pl.) angehängt.

Bitte zuerst sorgfältig die schon vorhandenen Erläuterungen lesen, bei Unklarheiten werden weitere Fragen gerne beantwortet.

The only time you're likely to hear people talking about staffs is when you're talking to wizzards or shepherds.

sorry, should have read "wizards".

I'd like to talk to all the sales staff.
The staff were/was happy with the new uniforms. (sing. or plural, no difference in meaning)
The staff at that shop are/is very friendly.
Six members of staff came to the meeting.

The staffs of the two companies were worried about the merger.
The staffs of QuickEat and FatFood both wore red uniforms.

The wizard carried a staff.
The two wizards both carried staffs.

Just for the sake of interest (not really relevant to your question)....

There is an alternate plural of staff, which is staves. It's an uncommon word, perhaps old-fashioned. But it hasn't disappeared entirely. It is occasionally seen as a plural for staff meaning stick - for example, "all the wizards left their staves outside the tent"), or for staff meaning musical staff ("piano music is usually written with two staves"). I have seen it in both those contexts, but never as a plural for staff meaning personnel... possibly simply it's very uncommon for this meaning of staff ever to appear in the plural.

Please help! I just have read this:

Playing Card Manufacturers
Updated On: 2/26/2007
To commemorate ratification of the 19th Amendment in 1920, U.S. playing card manufacturers replaced "staffs" with "hearts" as the fourth suit in the deck. The world soon followed.
 
http://www.4to40.com/omg/index.asp?id=2166&ca...

What showed this sign called "staffs" (before 1920)?

No. 13

Interesting.
The assertion doesn't seem to square with

http://www.wopc.co.uk/history/page_6.html