Yes, the sentence is correct.
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MaroldCould you please tell me what is correct and wrong?an ideal car (vowel sound)
Marold... but once I've seen it written this way.Just a minor point.
AnonymousIs this correct?'how grave a problem'
Do you not know how grave problem we are facing? no
CalifJimonce I've seen it .... = as soon as I've seen itYes, I know the other meaning of the subordinator, but I am wondering at the fact it cannot be used this way when emphasizing "once". I stick to the rule that if I want to put emphasis on something, I will place it to the front of the sentence.