Breakdown of Esta moto no es tan segura como un coche.
ser
to be
el coche
the car
un
a, an, some
no
no / not
Questions & Answers about Esta moto no es tan segura como un coche.
How does "tan ... como" work in this sentence to mean "as safe as"?
To compare things and say they are "as [adjective] as" each other, Spanish uses the structure tan + adjective + como. Here, we use tan segura como for "as safe as". Because the sentence starts with no es, the whole phrase means "not as safe as".
Why do we use "esta" and "segura" if the word "moto" ends in an "o"?
Even though moto ends in an "o", it is a feminine noun because it is short for motocicleta. Because it is feminine, any adjectives pointing to it must also be feminine. That is why we use esta (this) and segura (safe).
In the comparison, does the adjective "segura" match "moto" or "coche"?
Can I use "que" instead of "como" here?
No, for comparisons of equality ("as ... as"), you must always use como. If you use que, the phrase tan segura que changes the meaning entirely to "so safe that" instead of "as safe as".