Learn Swedish: De lånar alltid samma bok på biblioteket. - They always borrow the same book at the library.

Even though we use the definite article 'the' in English, the Swedish word samma (same) acts as a determiner that requires the noun to be in its indefinite form. So you say samma bok, never samma boken.

Why does alltid come after the verb instead of before it like in English?

This is due to the Swedish V2 rule, which says the verb must be the second piece of information in a main clause. Since the subject De is in the first position, the verb lånar must come second. Sentence adverbs like alltid (always) are then placed right after the verb.

Why do we use the preposition på instead of i for 'at the library'?

Swedish commonly uses på for public places, institutions, and workplaces where a specific activity occurs, such as på biblioteket (at the library) or på banken (at the bank). Using i (in) would sound like you are just emphasizing being physically inside the building.

How is the word De pronounced in this sentence?

Although it is spelled De, in spoken Swedish it is almost always pronounced like dom. You will hear native speakers say dom lånar.