Hi, Your sentence would read better as: It is very difficult, if at all possible, to do something. If at all possible -- if it can be done. You could discard at all , but I think it lays emphasis on the sentence.
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AlpheccaStarsThis is the most natural version. I have added a particular action, but you can use any action in its place"it is very difficult, if impossible, to stop breathing for more than three minutes and live."thank you for your reply. Do you mean "it is very difficult, if not impossible, to stop breathing for more than three minutes and live"? Oth