I need to find the simple subject and simple predicate:
Every sentence should begin with a capital letter.
I know that "sentence" is the simple subject but I'm not sure if the simple predicate must include the word "should" or if it's just "begin"
You're right that the simple subject is "sentence."
Yes, the simple predicate is "should begin."
You need to include all helping verbs in the simple and complete predicate.
A wheel is often used for that step what is the subject