Is jack and Jill went up the hill a sentence with compound subject?

Yes, "Jack and Jill went up the hill" is a sentence with a compound subject.

Here's why:

* Compound Subject: A compound subject consists of two or more nouns or pronouns joined together by a conjunction, usually "and."

* In the sentence: "Jack" and "Jill" are the two nouns joined by "and," making them a compound subject.

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