"Att" is actually supposed to be there in most cases, although is tends to disappear in spoken Swedish. When writing, it is more correct to write e.g. Försöka att (bli gravid) Fortsätta att (plugga svenska)
There are however a few words with which "att" can't be used. "Vill", "måste" and "få" are a few common ones.
@Alva That's true. I got stuck on situations when a verb follows directly after the first one, e.g. "Jag vill ha en bok i julklapp", "Hon vill äta frukost nu", which only would be true in situations where "att" usually works as an infinitive marker!
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