Questions & Answers about Das Buch kostet zehn Euro.
Why doesn't Euro have an 's' at the end if there are ten of them?
In German, masculine and neuter units of measurement and currencies usually stay in the singular form when they come after a number. So it is ein Euro, but also zehn Euro (not 'Euros').
Why is there an 'e' before the final 't' in kostet?
The verb is kosten (to cost). If we just added the normal ending for 'it' (-t), it would be 'kostt', which is very hard to say! Whenever a verb stem ends in a 't' or 'd', German adds an extra 'e' to make it easier to pronounce.
If the book cost 21 euros, how would I use the compound number here?
You would just swap out zehn for the compound number, written as one single word. The sentence would become Das Buch kostet einundzwanzig Euro. Remember that for numbers from 21 to 99, German puts the ones before the tens: 'one-and-twenty'.
Why are both Buch and Euro capitalized in this sentence?
In German, all nouns (people, places, things, and ideas) are always capitalized, no matter where they appear in the sentence. Both a book (Buch) and a currency (Euro) are nouns.
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