Learn Swedish: Hunden springer ibland i skogen. - The dog sometimes runs in the forest.

In a normal Swedish sentence, the verb must be the second piece of information. This is called the V2 rule. Because hunden (the dog) is in the first spot, the verb springer (runs) must take the second spot. Frequency adverbs like ibland (sometimes) are usually placed right after that verb.

Can I put ibland at the beginning of the sentence?

Yes, you can! But remember that the verb must still be in the second position. If you start with ibland, the verb comes next, so the sentence becomes Ibland springer hunden i skogen.

How do we know it's "the dog" and "the forest" instead of just "a dog" and "a forest"?

In Swedish, "the" is added to the end of the noun rather than as a separate word before it. Since both hund and skog are "en" words, you add -en to the end to get hunden (the dog) and skogen (the forest).

Could springer also mean "is running"?

Yes! Swedish doesn't have a separate "-ing" tense like English. The word springer translates to both "runs" and "is running". In this sentence, the adverb ibland (sometimes) tells us it is a repeated habit, so "runs" is the most natural English translation.