to be good for
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to be any good
To be suitable, useful, or of sufficient quality for a particular purpose. Very often used in the negative form ('nichts taugen' — to be no good) to express that something is unusable or bad.
Der alte Rasenmäher taugt nichts mehr, wir brauchen einen neuen.
The old lawn mower is no good anymore; we need a new one.
to be suited for
To have the necessary abilities, qualities, or character for a particular task, role, or profession.
Sie ist eine gute Mitarbeiterin, aber zur Chefin taugt sie nicht.
She is a good employee, but she is not suited to being the boss.
This verb is very often used in the negative form 'nichts taugen' (to be no good) or 'nicht viel taugen' (to not be much good). This expresses that something is unusable, bad, or of low quality.
Seine billige Kamera hat noch nie etwas getaugt.
His cheap camera has never been any good.
When you want to express that a person is suited for a particular role or task, you use the structure 'taugen zu etwas' (to be suited for something). Here, 'etwas' is in the dative.
Er ist ein guter Sportler, aber zum Teamkapitän taugt er nicht.
He is a good athlete, but he is not suited to being team captain.
The expression 'nichts taugen' (to be no good) is part of everyday language and can sound very direct and critical. In formal situations, one would often choose a different phrasing.
Ganz ehrlich, dein Plan taugt nichts.
Honestly, your plan is no good.
to be suitable
Both words assess whether something is useful for a particular purpose. „Sich eignen“ sounds neutral and is used with „für“ or „zu“. „Taugen“ is more colloquial, often sounds more critical, and is especially common in negative statements.
Diese Jacke taugt nicht für lange Wanderungen.
This jacket is no good for long hikes.
Diese Jacke eignet sich für lange Wanderungen.
This jacket is suitable for long hikes.
