Questions & Answers about Ist es vielleicht ein Schlüssel?
Why does the sentence start with Ist instead of Es?
In German, yes/no questions are formed by moving the verb to the very beginning of the sentence. To turn the statement Es ist vielleicht ein Schlüssel (It is perhaps a key) into a question, you simply swap the verb (ist) and the subject (es).
How would I answer this by saying 'No, it is not a key'?
You would say: Nein, es ist kein Schlüssel. Because Schlüssel is a masculine noun using the indefinite article ein, you negate it by replacing ein with kein (not a / no). You use kein instead of nicht whenever you are negating a noun that uses ein, eine, or no article.
Why is it ein Schlüssel and not eine Schlüssel?
Schlüssel (key) is a masculine noun. Whenever you use the verb sein (to be), the nouns on both sides are in the basic subject form, called the nominative case. For masculine nouns in the nominative, the word for 'a' is always ein.
Where else could I put vielleicht in this sentence?