Breakdown of Man muss das Werkzeug prüfen, sei es die Lupe oder die Pinzette.
sein
to be
es
it
müssen
to have to, must
oder
or
man
one / you (impersonal)
das Werkzeug
the tool
prüfen
to check / to test
die Pinzette
the tweezers
die Lupe
the magnifying glass
Questions & Answers about Man muss das Werkzeug prüfen, sei es die Lupe oder die Pinzette.
Why is the verb sei used here instead of ist?
sei is the Konjunktiv I (Subjunctive I) form of sein. In the fixed phrase sei es ... oder ..., it translates to "whether it be ... or ...". It expresses that the main statement remains true regardless of which alternative applies.
Why are die Lupe and die Pinzette in the nominative case when they refer to the accusative object das Werkzeug?
Because they follow the verb sein (in the form of sei), which is a linking verb that always connects two nominative parts. Even though they provide specific examples of das Werkzeug, the phrase literally means "whether it is the magnifying glass...", which requires the nominative.
If I were talking about plural tools, would sei es change to seien sie?
No. The phrase sei es ... oder ... is completely fixed. You keep it exactly as sei es, even if the nouns that follow are plural, for example: sei es die Lupen oder die Pinzetten.
Why doesn't the infinitive prüfen go at the very end of the entire sentence?
The main clause Man muss das Werkzeug prüfen is already grammatically complete. The sei es construction acts as a standalone appended phrase, so it doesn't push the verb prüfen any further to the right.
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