Mein Ticket ist kleiner als dein Buch.

to be

Breakdown of Mein Ticket ist kleiner als dein Buch.

• klein: small
• das Buch: the book
• mein: my; (masculine or neuter, nominative)

Questions & Answers about Mein Ticket ist kleiner als dein Buch.

Why is the adjective kleiner used instead of klein?

In German, to express comparative degree (“smaller”), you add the ending ‑er to the base adjective. So klein becomes kleiner.

Why do we say Mein Ticket and dein Buch without any article like das or ein?

Possessive pronouns (mein, dein) function as determiners and replace the article. In the nominative singular for neuter nouns (like Ticket and Buch), they remain in their basic form without additional endings.

Why is als used here instead of wie?

German distinguishes unequal and equal comparisons:

• als is used for unequal comparisons (“smaller than”),
• wie is used for equal comparisons (“as small as”).
  Since a ticket and a book are being compared as different in size, you use als.

Is dein Buch in the nominative or accusative case, and how can I tell?

It’s in the nominative case. After a comparative with als, the second term stays in the case it would have if it were simply the subject (here it’s not acting as an object of the verb). Both nominative and accusative forms of neuter singular are identical, but logically it’s nominative.

Why isn’t there a comma before ?