The correct version is"What you have done is wrong". In this form, "What" stands for "The thing that". The alternative "What have you done"... is a question.
yes
The term "very sorry for having done wrong" is a sentence fragment (there is no subject to form a complete sentence). The abstract noun in the sentence fragment is "wrong" a word for a concept.
Yes! Is correct sentence
No, it's, "I wouldn't have done that."
Not really. The "under development scheme" is particularly wrong.
No. Depending on the context of the sentence it should be If you have had a consultation or if you have done so, with consultation, blah blah
Yes. The correct way to say this is "you are done with this book."
it depends on what kind of sentence it's in.
No, because the order is wrong. The phrase should be: "would not have done" or "wouldn't have done" instead.
As the group's secretary........ is correct done is spelt with an 'e' at the end This will make the sentence correct.
there is nothing wrong with this sentence
Yes, it is- you can use that as a sentence by itself. "I" is the subject, "am" is the verb, and "done" is the past participle of the verb "do", used in this sentence as a predicate adjective modifying "I".