Hi Hans That's interesting. Without thinking, I broke the sentence with an adverb, with commas, so it's not clear whether I meant 'purpose' or 'result' - Sometimes I deliberately knit bad stitches so that I can understand what will happen - Sometimes I knit bad stitches, so that my knitting becomes a complete mess The first is purpose, the second result; and I've followed the rules that you mention I can see the logic of the rules but, to be honest, I say the sentence in my head and put a comma in if there's a one-beat pause in the sentence. So, personally, I wouldn't think it wrong to write: - Sometimes I deliberately knit bad stitches, so that I can understand what will happen The rule is good, but my view is that it won't always stand: I think the commas are there to show the natural pause of breath or thought.
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