Questions & Answers about Mein Herz ist schwach.
Why is it Mein Herz and not Meine Herz?
Herz is a neuter noun (das Herz). Because it is the subject of the sentence (in the nominative case), the possessive word for "my" is just Mein with no extra ending.
Why doesn't the adjective schwach have an ending here?
Adjectives in German only take endings when they come directly before a noun (like ein schwaches Herz, meaning "a weak heart"). When an adjective comes after a verb like ist to describe the subject, it stays in its basic, unchanged dictionary form.
I've seen the word Herzen before. Is that just the plural of Herz?
Herzen is the plural ("hearts"), but Herz is also a highly irregular noun in the singular! When it is used in the dative or genitive cases—for example, after prepositions like mit (with)—it gets an -en added to it. But here, it is the subject (nominative), so it remains just Herz.
Can schwach be used for things other than physical weakness?
Yes, just like in English, schwach is very versatile. You can use it for physical weakness, a weak battery, a weak coffee (ein schwacher Kaffee), or even a weak argument.
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