Comparatives of equality (tan como)

Comparatives of Equality: tan ... como

To say that two things share exactly the same level of a quality (meaning they are "as [adjective] as" each other), use the pattern tan + [adjective] + como.

In the city, the bicycle is as practical as the car.
En la ciudad, la bicicleta es tan práctica como el coche.

To say that something is not as [adjective] as something else, simply place no before the verb.

This motorcycle is not as safe as a car.
Esta moto no es tan segura como un coche.

You can easily use this structure to ask questions or share facts about different modes of transportation:

Is the bicycle seat as comfortable as the sofa?
¿El asiento de la bicicleta es tan cómodo como el sofá?
I am going to take the train because it is as punctual as the subway.
Voy a coger el tren porque es tan puntual como el metro.

Adjective Agreement

Just like with other comparatives, the adjective between tan and como must agree in gender and number with the first subject (the one being described).

In the following example, cómodos (comfortable) is masculine and plural to match los asientos (the seats), even though the second subject (mi cama) is singular and feminine.

The seats of this airplane are not as comfortable as my bed.
Los asientos de este avión no son tan cómodos como mi cama.