La tela de encuadernar cubre el cajo.

The bookbinding cloth covers the book joint.

Breakdown of La tela de encuadernar cubre el cajo.

• cubrir: to cover
• la tela de encuadernar: the bookbinding cloth
• el cajo: the book joint

Questions & Answers about La tela de encuadernar cubre el cajo.

What does de encuadernar do here grammatically?

Encuadernar is an infinitive, and in Spanish noun + de + infinitive often means something used for doing X.

So tela de encuadernar means something like binding cloth or cloth for binding.

This pattern is very common:

• máquina de coser = sewing machine
• gafas de leer = reading glasses
• papel de envolver = wrapping paper

So here, de encuadernar describes the purpose of the cloth.

Why is it la tela but el cajo?

Because Spanish nouns have grammatical gender:

• tela is feminine, so it takes la
• cajo is masculine, so it takes el

The articles have to match the gender of the noun:

• la tela
• el cajo

This is just a normal agreement pattern in Spanish.

What form is cubre?