Learn Hardcore Icelandic: Ég fer heim til að sofa.

Til að is a fixed phrase meaning “in order to” or simply “to” when you explain purpose. It introduces the infinitive sofa (“to sleep”) and tells you why you’re going home.

Why can’t I say Ég fer heim sofa without til að?

Icelandic requires til að before an infinitive when expressing purpose. Without it, the sentence is ungrammatical. You need til að to link fer heim (“go home”) with sofa (“to sleep”).

Why is sofa not conjugated here?

After til að, you always use the verb’s infinitive form. Think of English “I go home to sleep.” You don’t say “to sleeps,” so Icelandic stays in the infinitive too.

Is heim a noun or an adverb, and why isn’t it declined?

Here heim is an adverb meaning “home.” Adverbs don’t take case endings, so you don’t decline it. If you used the noun heimili (“home, residence”), that would be declined.

Why do we use the present tense fer to talk about going to sleep soon?