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Questions & Answers about Der Tag ist lang.
Why does the sentence use Der instead of Die or Das?
German nouns have grammatical gender. Tag is a masculine noun, so it takes the masculine definite article Der.
Why is Tag capitalized?
In German, every noun is capitalized, regardless of whether it appears at the beginning or in the middle of a sentence.
How can I tell that Tag is masculine?
Unfortunately, there is no all-encompassing rule for determining a noun's gender in German. You need to learn each noun with its article (der Tag). Over time, you’ll pick up patterns, but there are many exceptions.
Is lang an adjective, and why is it placed after ist?
Yes, lang is an adjective describing the noun Tag. In German, the verb sein (to be) is often followed by an adjective that describes the subject.
Could I use a comparative form, like länger, in this sentence?
Yes, but it would change the meaning. For example, Der Tag ist länger (als gestern) means "The day is longer (than yesterday)".