Are they just supposed to stop, or, having sounded out the letters and still being sure, would it not show more gumption if they read on and tried to work it out from the context?
They will have a much better idea of what the word 'might' be if they've decoded most of it; in those circumstances they might just be able to work it out from context. That's not 'forbidden' , the thing that is 'forbidden is actively teaching guessing from context.
On the other hand, it might be a word which is neither in their receptive or expressive vocabulary, in which case nothing is going to help.
Quite honestly, you could think up all sorts of 'what if' scenarios. What if they're up in their bedroom reading War and Peace?
Whatever sort of instruction a child is having there will be situations during the learning period when they will encounter words they haven''t read before (indeed, it is a lifelong 'problem'). A phonics taught child has more chance of getting closer to what an unfamiliar word is than a child who has been taught to guess.
You are also not hearing what I am saying about context. It is known (by people who have investigated it, such as in the book I mentioned earlier) to be unreliable. Look & Say reading schemes were deliberately written to make guessing from context more reliable because Look & Say had to resort to desperate measures to try and get children reading. If a child is reading a 'normal' book the author will not have made any effort to make 'context clues' obvious.
It is all very well to say that phonics should be the only strategy but then you are adding second strategy, so there are now 2 strategies - phonics and ask a grown up.
What's wrong with asking a grown up? When you are learning a skill you are perfectly entitled to ask a skilled person for help if you're stuck. What phonics teaching doesn't produce is children who blithely ignore what is written on the page (and heaven knows, I've encountered enough of them) in favour of their own guessing or who look at you helplessly when they encounter a strange word and say blankly 'I don't know that word'.
I think they can still read them inaccurately; they can choose the wrong (perfectly valid in other words) pronunciation for a particular spelling or they can put the stress on the wrong syllable and still not get it.
I agree that they may get the pronunciation wrong if they haven't yet been taught an alternative. Otherwise, they would try the alternatives they know and if the word is in their vocabulary they are likely to get it correct. Likewise with stress. Though I never found wrong stress to be such a problem as wrong 'sound'.
But really, all this is very dependent on what stage they are at with their learning and what sort of books they are trying to read independently. I can't pronounce all the names in War & Peace correctly, nor, if I am reading research papers, do I always know how some of the technical terms are pronounced (or what they mean). I don't have an adult to ask but I have other resources to go to for help. I certainly don't blame the way I was taught to read (which I don't remember, it being so long ago) for these little shortcomings. I just accept that you can never know everything there is to know about anything in life. (this doesn't apply to cg, of course, she knows EVERYTHING)
I encountered a new word only today (well, it might have been a typo
) 'noumen'. Anybody like to tell me what it means and how it is pronounced? (without googling it!)