Hello, everyone. I'm getting to be confused about the following problem. He usually eats sweets but not when someone is looking. He usually eats sweets but when someone is looking. I wonder whether the both sentences above are OK or the second one sounds unnatural. I heard the first one is ok and I have seen many in natives' writing. But the second one, in which I intentionally omitted 'not' after 'but', seems to be rarely seen to me. However, as a non-native I have got a thought that if 'but' could be considered as a prepostion, the second one also could be possible. Could I use the second pattern? Thanks a million in advance
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