What i really need from you is some sympathy sentence diagram?

In the sentence "What I really need from you is some sympathy," the main clause is "What I really need is some sympathy," with "What I really need from you" functioning as a noun clause acting as the subject. The subject is "What I really need," where "I" is the subject, "need" is the verb, and "what" serves as a relative pronoun introducing the noun clause. The phrase "from you" acts as a prepositional phrase modifying "need," while "some sympathy" is the complement, providing the object of the need.