Mostly, the superlative is presented as "am Adj +(e)sten" or "der/die/das Adj +(e)ste" in German. And most adjective is "+sten/ste". Just as the adjective suffix is "-sch, –d, -t, -tz, -ß, -z" ,it has to "+etsen/este". This way makes the pronunciation more easily. But there are some exception that just "+sten/ste".
List below is the adjective with suffix "-sch, -t, -ß, –d" but "+sten/ste" as superlative.
2.adjective suffix is "isch"
3.the adjective form verb participle
a.Partizip I：the adjective suffix is "end"
b.Partizip II：the adjective suffix is "ert、elt、tet"
The single syllable adjective and the vowel is a、o、u are needed to inflexion into ä、ö、ü.
This form is usually used as sentence-initial.
Am leckersten ist die Schokolade.(Most delicious is Chocolate.)
This form is used to narrate Nominativ noun(As the narrated noun is as subject.)
Die Schokolade ist die leckerste.(Chocolate is most delicious.)
There are some irregular inflection in German. And these are needed to remember.
viel / sehr
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