Question

When to use EIN & EINE in GERMAN??? ? PLZ REPLY ASAP....

Answer 1

RULE: The accusative is only visible, if it is formed on masculine nouns. In that case, the definite article 'der' changes to 'den' and the indefinite article ....'ein'....changes to.... 'einen'..... Thus, the accusative of feminine and neuter nouns is NOT distinguishable from their nominative forms.
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Answer 2

We use 'ein' for masculine and neuter nouns, and 'eine' for feminine nouns.