1 What is the longest that has ever taken you to write a book?
1a What is the longest which has ever taken you to write a book?
2 What was the longest that has ever taken you to write a book?
3 What was the longest that ever took you to write a book?
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None of the sentences is correct, Me_IV. All of them are ungrammatical.
@David, Moderator posted:None of the sentences is correct, Me_IV. All of them are ungrammatical.
Absolutely. Me_IV might want to know that the adverb "long" cannot be the subject of a clause
Do you mean that "it" is missing?
1 What is the longest that it has ever taken you to write a book?
1a What is the longest which it has ever taken you to write a book?
2 What was the longest that it has ever taken you to write a book?
3 What was the longest that it ever took you to write a book?
Yes, adding "it" solves the problem. Using "which" or "that" is unnecessary.
