Numbers, ein, and viele as Adjective Triggers

By B2 you know that the determiner picks the adjective pattern: der-words give weak endings, ein-words give mixed, no determiner gives strong. Numbers and quantity words are where that clean rule gets genuinely tricky, because some of them count as "a determiner" and some don't — and the ones that don't make the adjective do extra work. This page resolves the puzzle that trips up even advanced learners: why zwei gute Freunde and viele gute Ideen take strong endings, while alle guten Freunde and beide kleinen Kinder take weak ones. The split is not arbitrary. It follows from one question: does the quantity word inflect for case, or not?

The governing principle

The noun phrase needs gender and case marked exactly once, by the strongest available element. So the only thing that matters is whether the quantity word carries a case ending of its own:

• If the quantifier does not inflect (it shows no case ending), it cannot mark the case — so the adjective must, and takes strong endings.
• If the quantifier inflects like a der-word (it shows distinct case endings), it marks the case itself — so the adjective relaxes to weak endings.
• ein is the special case: it inflects in most slots but goes blank in three, so it triggers the mixed pattern (covered fully on the mixed declension page).

Here is the whole landscape in one table:

ein: the mixed trigger

The numeral ein (one / a) is identical in form to the indefinite article, and it triggers the mixed pattern. In the three slots where ein is endingless — nominative masculine, nominative neuter, accusative neuter — the adjective takes a strong ending; elsewhere it is weak.

Because this overlaps entirely with the article ein, learners rarely struggle here. The trouble starts at zwei.

Bare cardinals (zwei, drei, vier…) → strong

From zwei upward, German cardinal numbers do not inflect — zwei, drei, vier keep one fixed form in every case. (The rare exceptions are the genitive forms zweier and dreier, treated below.) Since the number shows no case, the following adjective must, so it takes strong plural endings — exactly as if no determiner were present.

The genitive deserves a note: the literary genitive cardinals zweier and dreier do show a case ending, but they are themselves strong, so the adjective stays strong too — die Meinung zweier guter Freunde (the opinion of two good friends), with -er on both. This is elevated register; in everyday speech most people rephrase with von zwei guten Freunden (dative).

viele, wenige, einige, mehrere → strong (and the adjective AND the quantifier are both strong)

This is the cell competitors get wrong. The quantifiers viele, wenige, einige, mehrere, andere, and the invariable ein paar are not der-words. They take strong plural endings themselves — and crucially, the following adjective also takes strong endings. Both words wear the same case ending side by side:

The exception inside this group is ein paar (a few), which never inflects at all: ein paar gute Freunde — the adjective is strong, ein paar itself frozen. Don't confuse it with ein Paar (a pair), which is a counted noun.

alle, beide, sämtliche → der-words → weak

Here the pattern flips. Alle, beide, sämtliche, and solche (in the plural without ein) decline like der-words — alle, allen, aller show distinct case forms just as die, den, der do. Because they mark the case themselves, the following adjective relaxes to weak endings:

So the heart of the puzzle is this contrast, both in the nominative plural:

Viele cannot show the case, so the adjective does: strong -e. Alle is a der-word that does show the case, so the adjective coasts: weak -en. Same slot, opposite endings, for one reason only — whether the quantifier inflects.

English contrast

English numbers and quantifiers leave the adjective untouched: "two good friends," "many good ideas," "all the good friends" — good never moves, and the number is a separate word that carries no grammatical agreement. German makes the adjective an active part of the case-marking system, so it suddenly matters whether zwei or viele or alle can pull its weight. The mental shift is to stop seeing the number as just a count and start seeing it as a determiner-slot that is either pulling its weight (alle → weak) or shirking (zwei, viele → strong).

Common Mistakes

The signature error: treating zwei as a der-word. Since the number shows no case, the adjective must — strong -e in the nominative/accusative plural.

Viele is not a der-word; it takes its own strong ending and the adjective takes strong too. The two share the same -e, not a der-word's weak -en.

The mirror trap: lumping alle in with viele. Alle declines like die, so it marks the case and the adjective drops to weak -en. This is the one quantifier-cell that goes weak.

In the dative plural the quantifier (mehreren), the adjective (guten), and the noun (Freunden) all carry an -n. Dropping it from the noun is the most common slip in this whole area.

Key Takeaways

• The test is whether the quantity word inflects for case.
• Bare cardinals (zwei, drei…) don't inflect → adjective is strong (zwei gute Freunde).
• viele, wenige, einige, mehrere, andere, ein paar aren't der-words → adjective is strong, and the quantifier itself is strong too (viele gute Ideen).
• alle, beide, sämtliche, solche decline like der-words → adjective is weak (alle guten Freunde).
• ein is the mixed trigger, exactly like the indefinite article.
• Same slot, opposite endings: viele gute vs alle guten — the only difference is whether the quantifier can show the case itself.