Breakdown of Eine Isomatte ist sehr bequem, hast du auch eine?
sein
to be
ein
a, an (eine)
du
you (informal singular)
auch
also, too
Questions & Answers about Eine Isomatte ist sehr bequem, hast du auch eine?
Why does the sentence end with eine instead of eins?
The word eine at the end is an indefinite pronoun replacing Isomatte. Because Isomatte is feminine (die), the pronoun must be feminine too. It is the direct object of hast (accusative case), and the feminine accusative pronoun is eine.
Is the first Eine in the sentence the exact same kind of word as the second eine?
Not quite! The first Eine is an indefinite article (a/an) attached to the noun Isomatte. The second eine is an indefinite pronoun (one) standing entirely on its own to replace the noun. For feminine words they happen to look exactly the same, but for neuter words they are different (article ein vs. pronoun eins).
If we were talking about a masculine noun like a sleeping bag (der Schlafsack) instead, how would the end of the sentence change?
You would need the masculine accusative pronoun einen, because it is the direct object of the verb hast. The second half of the sentence would become: hast du auch einen? (do you have one too?).
What is an Isomatte exactly?
It is the standard German word for a camping mat or sleeping pad. It is actually a shortened version of Isoliermatte, which translates literally to insulating mat.