Learn Icelandic: Hún hjólaði líka í bæinn í gær.

The dictionary form of the verb is hjóla (to cycle). This is a Group 1 weak verb. To make it past tense for singular pronouns like hún (she), you drop the final -a and add the suffix -aði, giving us hjólaði (cycled).

Why is the word for town written as bæinn here instead of just bær?

The base word for town is bær. Here, two things are happening. First, the preposition í (in/to) is being used to show motion towards a place, which forces the noun into the accusative case (bæ). Second, Icelandic attaches the word for "the" to the end of the noun. The accusative masculine ending for "the" is -inn, combining to make bæinn (the town).

Why is líka (also/too) placed right after the verb instead of at the end of the sentence?

In English, we usually put "too" at the very end of the sentence. In Icelandic, short adverbs like líka (also) and ekki (not) usually go right after the main verb. That is why Hún hjólaði líka is the most natural word order.

We use í twice in this sentence. Does í gær literally mean "in yesterday"?