This is such a difficult book that I can’t understand it. This book is so difficult that I can’t understand it. This book is too difficult for me to understand.
Top answer
Those are all OK. #1 is a little awkward and is probably not used as often as the other two.
— Mister Micawber
Those are all OK.
#1 is a little awkward and is probably not used as often as the other two.
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