Ik zweer voortaan te sporten.

Questions & Answers about Ik zweer voortaan te sporten.

How would you say this using a dat-clause instead of te?
You could say Ik zweer dat ik voortaan ga sporten. Because the subject (ik) is exactly the same in both the main clause and the subclause, you can drop the second ik and the auxiliary verb, shortening it to a concise subclause using te + infinitive: te sporten.
Why does voortaan come before te sporten?
In this type of clause (beknopte bijzin), the te + infinitive goes at the very end of the sentence. Any extra information, like the time adverb voortaan, gets sandwiched between the main verb (zweer) and the te construction.
Does zweren mean 'to swear' as in making a promise, or 'to swear' as in using bad words?
It means 'to swear' as in taking an oath or making a solemn promise. If you want to talk about cursing or using bad words, you need the verb vloeken.
Could I use vanaf nu instead of voortaan?
Yes, they are interchangeable here. Voortaan is a single adverb meaning 'from now on' or 'henceforth'. It is very common in Dutch and a great B2-level alternative to the slightly bulkier vanaf nu.

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