" and I was wondering if "that" is needed in the sentence? No. You can leave it out or leave it in.
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Hans51"What are you saying that I did wrong?" and I was wondering if "that" is needed in the sentence?No. You can leave it out or leave it in. It comes from a statement in which 'that' is also optional: You are saying (that) I did something (=what) wrong.
Hans51what functions as a conjunctionNo.
Hans51"Tell me that who you like" and here "that" is also optional, right?It’s wrong. The subordinator that is used in declarative, not interrogative, content clauses (I told John (that) he could come over).