i cant figure out simple subjects and simple predicates in a sentence

Let's start with the simple predicate, which is the verb. The simple subject is the person or thing that is doing the action.

Examples: The simple subject is boldfaced, and the simple predicate is underlined.

Mom just went to the store.

One of my friends is on the basketball team.

Some countries in Europe do not use the euro.

This site has more information and examples.

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