Question 1

Why do we use quão instead of como for "how fast"?

Accepted Answer

In English, "how" is used for both methods ("how does it work?") and degrees ("how fast is it?"). In Portuguese, como is only used for methods. When you want to express the degree or intensity of an adjective or adverb (like "how fast" or "how big"), you must use quão or o quão.

Question 2

Could I say o quão rápido in this sentence instead of just quão rápido?

Accepted Answer

Yes! In indirect degree clauses like this one, quão and o quão are completely interchangeable. Adding the article o is very common in everyday spoken Portuguese, while dropping it can sound slightly more formal or literary, but both mean exactly the same thing here.

Question 3

I thought rápido was an adjective. Shouldn't it be the adverb rapidamente here?

Accepted Answer

You could absolutely say quão rapidamente, and it would be perfectly correct. However, in modern Portuguese, it is very common to use the masculine singular form of certain adjectives (like rápido, lento, and duro) as adverbs. Because it acts as an adverb describing how they retain the image, it stays masculine and singular regardless of who is doing the action.

Question 4

Why does the Portuguese sentence use conseguem instead of podem for "they can"?

Accepted Answer

Poder is generally used to express permission or general possibility. Conseguir focuses on having the ability, skill, or success in managing to do something. Since retaining a mental image is a cognitive skill that requires mental effort or capability, conseguir is the much more natural choice here.

É incrível quão rápido eles conseguem reter a imagem mental.

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