the sentence starting with the word unless is subordinate clause. The nervous system of small children is not yet developed enough for them to keep still for more than a few seconds at a time. that sentence is in the second line is main clause.
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CliveHi,Initially I thought so too. But does 'to keep still...unless they are asleep' really make sense? Semantically, shouldn't it be 'not to keep still...unless they are asleep'?
'Keep still'.
Clive
CliveHi,
I'm not sure if you are recommending an additional 'not', or simply moving the original 'not'.
Moving the original 'not', that is. What I mean by moving is not that it has to be moved as 'yet