| Kommentar | >>Maybe it's because "advisable" is a pure adjective and "recommended" is a past participle being used as an adjective
That's pretty much what I was thinking; the participle makes it into the passive voice, but there's no real subject (Caution is recommended) and no agent with 'by' (The hotel was recommended by every guidebook). Without either of those, the ultra-passivized form just sounds so awkward, even though it's not grammatically incorrect in the way that *It is recommended doing is.
Like you, I wouldn't take off points for it, but if I were Henk, I would strongly recommend that students not use it. I doubt that Australian usage is particularly suspect, but German interference might be, and the same is true of other languages, which might go a good way toward explaining a large portion of the internet hits.
(OT: Just in the last couple of years, now that social media have taken over the world, internet hits for almost everything have become even less reliable than before. Even sites such as the BBC are full of blogs and user comments; university sites often include student blogs and homepages, and Google is notorious for inflating its numbers, which tend to drop by orders of magnitude a few pages in.)
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