Learn Hardcore Swedish: Jag äter en smörgås utan ost.

Swedish verbs only change for tense, not for person. äta is the infinitive “to eat.” In present tense it becomes äter for all subjects (jag, du, han, hon osv.). So Jag äter means “I eat” or “I am eating.”

Why does smörgås take the article en instead of ett?

Swedish nouns have two genders: common (en-words) and neuter (ett-words). smörgås (sandwich) is a common-gender noun, so its indefinite singular form is en smörgås. Neuter nouns use ett, e.g. ett äpple.

Why do we need the article en before smörgås, when in English you sometimes say “I’m having lunch” without “a”?

In Swedish, any singular, countable noun must have an indefinite article (en or ett) if you’re talking about one unspecified item. English can drop “a” in some idiomatic expressions (“having lunch”), but Swedish always requires the article: en smörgås. If you meant several, you’d use the plural smörgåsar (no article).

Why is ost used without any article? Could you say utan en ost or utan någon ost?

ost is an uncountable noun when you speak of cheese in general, so it appears bare: ost = “cheese.” After utan (“without”) you leave it bare: utan ost = “without cheese.”
– utan en ost is ungrammatical, because you don’t count cheese that way.
– utan någon ost (“without any cheese”) is possible if you want extra emphasis, but usually utan ost suffices.

What does utan mean, and how is it different from inte?

utan means “without” and links two things (e.g. a sandwich and its missing ingredient). It specifies absence of something.
inte is the general negation particle that negates a verb or clause.
– Jag äter inte = “I do not eat.”
– Jag äter en smörgås utan ost = “I eat a sandwich without cheese.”
If you said Jag äter inte ost, you’d mean “I don’t eat cheese” (ever), not “the sandwich has no cheese.”

Why is utan ost placed at the end of the sentence? Can its position change?

Swedish main clauses follow S-V-O-Adverbial order. utan ost is an adverbial/prepositional phrase describing the manner or condition of the eating, so it comes after the object (en smörgås). You could front it for emphasis (“Utan ost äter jag en smörgås”), but that sounds marked. The neutral order is Jag äter en smörgås utan ost.

How would you turn this into past or future tense?

You only change the verb tense:

Past: Jag åt en smörgås utan ost (“I ate a sandwich without cheese”). åt is the past form of äta.
Future: Jag ska äta en smörgås utan ost or Jag kommer att äta en smörgås utan ost (“I will eat a sandwich without cheese”).