This is a start. type "relative clauses" in the search box above or into your search engine. Who which we use to replace pronouns for people and things, we also use that.
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AnonymousI was wondering if you can help me with theseSee
Anonymous1-The most fascinating problem in the world is ( who I amSee the links in the post above./ who am I) ?2- If one of the participants in a conversation wonders (what did the other person say/ what the other person said ) ??and so on ....
AnonymousI want you to elucidate the usage of inversion